Malicious PDF — malware analysis report

Static analysis result for SHA-256 638d886ae0990d5f…

MALICIOUS

PDF

84.9 KB Created: 2021-06-29 18:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: cf2669fe8ec2bd36082a2d948c566d9d SHA-1: b6ac0705e621b736162f8657a829a66b97f325e2 SHA-256: 638d886ae0990d5fc0dee31b58811757c606ab14f41a43365e6f5069394ae150
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests these links are designed for SEO manipulation or to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://teaandtiarasottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/zumuj.pdf In PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/natufenakuwegem.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/fedagenatokonozafa.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///75452503239.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/bbb112f2ea26359f9e40488265d9482b/jibivuluzarenukajiwebelu.pdfIn PDF document text
    • http://szwygs.com/upload/61245889690.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f5d0327ba---76075682079.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/e3b423bf09300023571e2bcd5ec9427a/70550014716.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/44a11b925c3758b3cdeb0e509108c4aa/silomuluxugok.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/piwubam.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cac640c916---7212341492.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/mfog9f2r8gh01ucecid2ih9q82/41649143969.pdfIn PDF document text
    • https://steammining.com/userfiles/file/57079392207.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/d3s1neoog87jrcqkvrv8gi8vcb/83015590941.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/59321879321.pdfIn PDF document text
    • http://alhs1973.com/clients/64426/File/maxakejimemujerijaru.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/a6eff757f1e0914dccc01c83b477600c/xileturijakomabutidiripu.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888f4dd2ea7---faxapox.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/unecuiflqpbk0m7bfej6ba9abm/27643277538.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098456a85616---41930281800.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/85415247970.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080f345bd9f0---16992701913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+sims+mobile+modsPDF 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

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_off0000ebc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC1 16892 bytes
SHA-256: 34140478f602963db402542e81b53357940e6acb34b606b3743f1c724bff6d34
font_01_sfnt_off000117d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF0 10152 bytes
SHA-256: bddc753c53bd3b547300cfa335236d34ce3922fee0c58df2a96b1a2390462f35

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