Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d6faa3f5e33bfd…

MALICIOUS

PDF

85.9 KB Created: 2021-09-02 08:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 26a093bd5d2dd09fc795a215bb993ed3 SHA-1: 5ffa1877a5ae968ecba0533441c78b4b86edb731 SHA-256: a4d6faa3f5e33bfd37c74d9f099b103585a6371a1dd99e00b2e7add95842cf31
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, indicating a phishing or spam distribution scheme. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ceccarbotosani.ro/userfiles/file/99949282409.pdf In PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160828acba20a4---wimulusa.pdfIn PDF document text
    • http://ligneus.hu/upload/file/nijoxunavisawogerojefe.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/g4d4b90cucr9fgbqemuq6jjvp2/65866992921.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/33638471883.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160db060dd92ae---punit.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/602cfe45021030d0682ef9e19cbad25c/42417920830.pdfIn PDF document text
    • http://zimmerei-possert.at/nasipanivo.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/7d82a0d57f14c1dd48424430891bb3c2/79135655011.pdfIn PDF document text
    • http://bienbao.net/uploads/files/bemeboterukavetebemiv.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/64013138343.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b9a3784076---nuvubalukifoxi.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee733653688---63742451369.pdfIn PDF document text
    • https://clinicscrm.com/img/files/zunojepemuwuwowodobewul.pdfIn PDF document text
    • https://bonekarusa.com/contents//files/nowisazonomabuzukam.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/40743196558.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021081121311851.pdfIn PDF document text
    • https://vzglavniki.net/data/file/38192379713.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/g15mili9ho6j50ff4672rtgrcj/33136999216.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/besugesajuru.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/58435830358.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/fn8pl12c048taf5ptpungb4c80/46855269827.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b0e203271---70231343484.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/82127695838.pdfIn PDF document text
    • http://krugernilssonreunion.org/clients/c/c3/c301050bdfa85653d7453904791897ac/File/5971889827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=blood+pressure+medication+and+impotencePDF 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_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 10828 bytes
SHA-256: 2aa74e9c026fb5aa0d4a05e49440fbf7a929dfc77795f940900029834af514b0
font_01_sfnt_off00010366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B78 17524 bytes
SHA-256: 79b66dbd44b284079424915f336d0383a264e02110bb8a8f21668f27bc9e105d

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