Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7813f1fef3a35a2…

MALICIOUS

PDF

83.0 KB Created: 2021-08-25 04:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 26bda26bb44ea21dcf8de323f2082b84 SHA-1: b80e0800319c4bcbf2c8d550146ab244a89a3b56 SHA-256: f7813f1fef3a35a20881688966ff5cecca940b0795f9e5be346235a17a7a2480
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing content to analyze.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160710c72c59b0---rolelafaxozul.pdf In PDF document text
    • http://phuketdriveschool.com/userfiles/file/5186272349.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2d8dcdd93---90712245770.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/65358256005.pdfIn PDF document text
    • http://newmob.it/userfiles/files/wifuvuvig.pdfIn PDF document text
    • http://tipiland.net/upload/file/95768019249.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nr2f1tksg0744hpfvqb4c17de4/domogak.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/47da909f9916d80bc670bd919665bf85/tilopanifujomu.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097110e468a5---7344995053.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/vanetuvukimejif.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/livuregu.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f2e53d803---71379762288.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/32rd8li6c2cqnpko8f31h45jo4/33528379577.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609415a1a749f---zotivukuvanarepajomotovav.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/sojerodo.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6b1ddc644507de464905bcc1d64eb410/76721992883.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/c66e4cf37233d6a545998f7df1257fb4/figagopekewoparebisepunu.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/saxemanimetone.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/760fee04d21c38bb334ab73a00fcad3f/purugabexenosatu.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611ce3f720bc9---23178497865.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ekpf668ngs69labnufnvlmqht2/46122713306.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c30d72d50---57804521610.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610147cb1dea8---99483860690.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/81303914466.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/68204221642.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/13945136868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=friv+the+oldPDF 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_off0000e45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45B 16772 bytes
SHA-256: 886eceac0fbcd7f611bf2111b97cc201ee9fd2f074abc8300f95a136bbf8ef91
font_01_sfnt_off00011027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11027 9956 bytes
SHA-256: 539fc60a9734ba8f5389be41ef276278c36e99ad05f3fd5ec4bb057f66cc86d8
font_02_sfnt_off00012641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12641 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1