Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6a907e3b2f59b4…

MALICIOUS

PDF

86.2 KB Created: 2021-07-07 01:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 77ed4c16302f59265c7d8e272dc5eda9 SHA-1: 67e0184ecc06b1a09d174d00d6a49b3be7f7113c SHA-256: df6a907e3b2f59b451b9f5cb484023233cf0abaac0d5e94e30a053a878119561
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits multiple high-severity heuristics indicating malicious intent, including a ML classifier flagging it as malicious and ClamAV detecting it as a phishing trojan. The document employs a social engineering lure, prompting the user to install a browser extension or update, which is a common method for delivering malware or stealing credentials. The presence of numerous links to compromised CMS upload storage and disposable hosting further supports its role as a distribution point for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609444d766da5---komafuwinetowadunanogusom.pdf In PDF document text
    • https://tonitomov.com/picture/file/4200277779.pdfIn PDF document text
    • https://nowtravelasia.com/userfiles/files/bobuzolonokoruxufororuf.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/tjssjddi9915s04jimbfukkuob/79947026950.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/5f6ebb9d44099e42880cbeabc07f7a90/6653225995.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/qe41bvomr9jgo5l4jpd7lb8tev/bubinabin.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/cc4babb99a62a800421b6690560ccbf4/99221579021.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160868fdd1dbd1---kolewifatikelozugu.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/93390115700.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c5ad57ff096fdff9a9be22e77f27af98/33569740703.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbabcda3a5---45481958817.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3f449ffd6---45261745088.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16070a6ddb7241---bejenipotofo.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bbcee13298fd2a5a5fe0af3928c9e313/17861042488.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/29d46a6b05758a6f31498557bf67c8dc/9855423625.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/3a2f22a84a09d0ed7766493e287b8d5f/vikapakuk.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16082f044b609a---rulavelalejojonu.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/fobejaxajabopexe.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0d27d60ec---88857401745.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098472f24e75---luwejawosibivixazuwit.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e187d89870---38646759126.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74cc060f0---348784610.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de1c0078acc---78891745163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=elephant+and+castle+wings+caloriesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1A 17892 bytes
SHA-256: 486aff8681972d15f78531649c4aaa7278a3ace10352870ec0c633536648eb5d
font_01_sfnt_off00011919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11919 10864 bytes
SHA-256: 05e89ba4c34062d1442a4afb82bf9964071c005dd31deb2bf851581c6fdd5e66
font_02_sfnt_off000131f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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