Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8aa56688b9d371…

MALICIOUS

PDF

93.4 KB Created: 2021-07-05 02:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3529cb17341ebe256d1b5e2390b0ba19 SHA-1: 0da8220585666bb65c71ae8fbd5b1aee9f60b787 SHA-256: bc8aa56688b9d37101a6b4101688c32725cb397aeddf6c847e9144deba7fe134
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress installations, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075df84d922c---kefesofaduxe.pdf In PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/a64j547n28akfjn2f621v1t8m8/xevewapoxevudupin.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/zowalowowuwagurotaxegoj.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf5ec8e0c1---37815107870.pdfIn PDF document text
    • https://belhasasecurity.com/userfiles/file/fexogunofe.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b46c039fb94---mokives.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076225aa0993---62435288648.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095535cdf035---236278975.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/fc314de1b96eb31df7b377db7251961d/39552525979.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/timemowolumejewuni.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0de4a9683---4848151850.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/mv03kjrotv58orjmvjm0rfuta3/norevobusezez.pdfIn PDF document text
    • http://momsystem.ru/public/file/51736593111.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/b4ab7d76b217dce805e679d398ae11c4/letavafabuzoradenopi.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c412a896c---42954726995.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/4m6f59g506cvkii3vi25v5h1rt/famalire.pdfIn PDF document text
    • http://garderoba.sk/images/_file/25784223961.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/f3jpdqfatun255r4d5blskmk4v/xulomikepigefefufotor.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/m2lvl7r3i7sk46u6e9b995lofv/70280432477.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4107dd64bc---nalis.pdfIn PDF document text
    • http://didopack.com/files/luruburexutifimilokeni.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccc7d14d7c---32633804982.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/jameduxamepibivaxixixed.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdba90b1218---59874746306.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/a3f85b93f124a3fecdff64f330d6655a/zinagazasuporanuxun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=time+sequence+pattern+organizerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 10940 bytes
SHA-256: d6522c6014165c10c49c725e6ad6d84a23900c1b5514b3b48a67c7c1e25ad472
font_01_sfnt_off000107b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B7 17320 bytes
SHA-256: 897de75dc577dbddfee4287cf545b7c37c1b15390c4cffd7434578ae1755e8eb
font_02_sfnt_off0001219c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219C 17188 bytes
SHA-256: c19e0d69715983a165fbccabe123cc479f199c81074547bb96afa698acac4a1c
font_03_sfnt_off00014def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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