Malicious PDF — malware analysis report

Static analysis result for SHA-256 96ae8c875de8d51f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 20:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dc488ba94f7214bba1d3e5dd53119327 SHA-1: ef49cf1e90b38988649b60e898f48615d011d9ca SHA-256: 96ae8c875de8d51f1d44ab19fd6547f44b911c53efbf55d4c4c432d32745f1f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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 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://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/bb63a19a95bf5e1be30ee2723e94a0db/60602915037.pdf In PDF document text
    • http://agcslohian.com/userfiles/file/43352189241.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/92765826873.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d52256a5caa---75466541677.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/27697825287.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/xepibadalagirokej.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/r54il16b3q1akc0r9ncd8ld4u5/60193834748.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/81616566770.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/66618177750.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fd0314c6b---xitaralog.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/78116265513.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/40265534153.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876ce4aa5d7---10358199827.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/nuvofokugemureriseminukuv.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/19509976542.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/18754342065.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/tesuminufafusap.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/13971812820.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/kezulijifawumap.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/pepibulupe.pdfIn PDF document text
    • https://reha.bg/content/upload/file/86635927433.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/vhm47njvo65o0a7hfk55hdt7e2/90662295214.pdfIn PDF document text
    • https://mahae.hu/files/files/22350683581.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98eaf2b7c---37782667605.pdfIn PDF document text
    • http://allycatering.com/userfiles/64162652003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=converting+decimals+to+fractions+worksheets+8th+grade+pdfPDF 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_off0000d636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE48 18340 bytes
SHA-256: 81e3a1b7bf17df3671632c8b571f8d4f786ec85dc0424b5da84b753d6a01a3ed
font_02_sfnt_off00011d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8B 11548 bytes
SHA-256: bdf5dfc6a6eea44405a660b185e6eeb6f2e525576ffe7d6b766c8f944be2c015

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