Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dfc955638fbde3b…

MALICIOUS

PDF

97.1 KB Created: 2021-07-02 23:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 36df210103cbe0a577246157e24970f4 SHA-1: 373a43116d6a33d30c4785cf314858ddfc06ce1d SHA-256: 7dfc955638fbde3b267bfd51c36ea60dab21e52c1ac6c726c270d389b7c6a426
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs that point to compromised websites or disposable domains. The presence of these links suggests the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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 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://synerhu.ru/uplcv?utm_term=good+attention+getters+for+a+speech PDF link annotation
    • http://erex.hu/upload/file/vusoxafibinilifepanagi.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/8h6n4pjp21i0habgqlr4393p5o/molakoximekitaneduz.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e04c922dfe---wepezezabaleloled.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd5c075c40---22586939608.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/f7ec077cb9a4d0c76c18bf292beed9cf/xubamofubebatomowig.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/82829223115.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2823c8cc1822f8ab163a3772bb9931d/24669051841.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/43122559402.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//vaxagatevavakuxuwas.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/8cf4ed1535cd631d1ffa6123b526fdc9/78498469440.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/d866efd918bd799716a06fe075a96580/vusifazetupasitoj.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/f645813c06e3c7172aa17bc69fd2d69a/xadana.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ddd7cdc78---koxokujelowejivojosago.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/74438484161.pdfIn PDF document text
    • https://faprosid.com/file/rikev.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16091f8f4d787c---20811093996.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/fd2b85878fcad731996bb14275bad49c/soparifegusufezo.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092dc2614c31---dajiwenaxisemo.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/25170968450.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/76877746715.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d46a5a490---52245960207.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/rejonagigewa.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/s82p434jgtg2dudgtngfe5dbg1/xojakuweteg.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13246 16984 bytes
SHA-256: 2d697ef4422a38801603bb93ad07f172fac4c20a9b79b68cd2809071fb6e5dca
font_02_sfnt_off00015e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E4E 10892 bytes
SHA-256: deb06fc81ebfba97bb6a4bff6708b685d994d324f7046434201a7e2d7111ecc3

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