Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b99521be16d3eb8…

MALICIOUS

PDF

87.9 KB Created: 2021-06-26 09:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 6bce2fe957c88e4c53e10d296b072e26 SHA-1: 2dd883cbd90e76a63b63f5243f4a8bb12d2e7b00 SHA-256: 0b99521be16d3eb83ccda2405d7e05ec209648487bdc154d9f6b2215b38daf23
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress uploads and disposable hosting domains. These links likely lead to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=use+of+span+tag+in+html PDF link annotation
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/23478243328.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/20a91394f5315446224bb01b5f1721da/51878038129.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210527_174345.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88fd45cd5---3738580525.pdfIn PDF document text
    • https://melz-feu.ru/upload/47722861464.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d21510d7bb9bab782c18721b81a0cfcb/44490645817.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/9f18bf2a5a3b133a9814154b2141779a/pofajuraxarokavemavon.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a06f82a72ac---84894793653.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/sisupopevixineliwu.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/cjd49g8ud896hj0mddbs2e9nup/46965061806.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/0c2306b097c42efe5f2122fa0ae9ad0f/verunevujos.pdfIn PDF document text
    • https://anakaygame.com/calisma2/files/uploads/zikom.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/06a346efc98b2882ee256cf0940e2f28/nedebiri.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/21683506985.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1472762d5e---98639448370.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/wokaro.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/141209004810.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608591ad17f12---rotujodasibexeli.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/92124cc3d15b46a67ba39d642d747977/56845355673.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5635c05acb---tasodelaviv.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/b8ec142k58rv0ajif2r77jf3f3/finadaguka.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/16170242456.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/51765383389.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/65418013603.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10562 10712 bytes
SHA-256: b6db50bd3a170bce8eca0acd98b55e0c79bba12eb7f6f63656ab7f019d2a199a
font_02_sfnt_off00011dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD0 20888 bytes
SHA-256: 798e4ba11400064257fe2da9f0ff456fec22f9858b860c07e29d0efe43c9d90f

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