Malicious PDF — malware analysis report

Static analysis result for SHA-256 591bdea6a08e29ee…

MALICIOUS

PDF

86.5 KB Created: 2021-08-24 03:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d3aabf52c10df9adb493b98198188815 SHA-1: 69ba74feb8ffd99a3967f251b143c9486d2c5d19 SHA-256: 591bdea6a08e29eea09c0fdc08d35e6b3464acb711fd094e38bdfde3a1989a31
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs further supports its role as a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075e82c1a1ed---66153825573.pdf In PDF document text
    • http://svaz-podnikani.cz/files/file/fitarisumudesezaferat.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210714_145522.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/masame.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/vilaramizawexawumakati.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/ce53bcfbb9634565cb9a82502b1a48b6/mipusugulu.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/95131957330.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b047afa7615---kawixatokesosoligatu.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d16c6621f---juwef.pdfIn PDF document text
    • http://midel.me/userfiles/file/90089171116.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24fc183766---nugileme.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/95216313531.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/36457872734.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/29373a1c6859be4b805c717be49a4193/91167348657.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8f7071bf4558e82b78164fb8f287632e/26941183660.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/suekatatvkftlrgsb4tbulos27/86832424085.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/3653c7e2080b9a4a47bef94fb341051a/86320426566.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608676798e862---widojazudenekib.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/xevupejiwidip.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/zeguvu.pdfIn PDF document text
    • http://steinemann-ag.ru/teritanelokod.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/tevolukopona.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/90066991e35cfd0dbbb2c8ea95c10453/464251658.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/wexumubajibut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=online+photo+cropping+toolPDF 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_off0000eff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF8 10348 bytes
SHA-256: 60ec1add6e924e8a9a6ed2808811a010269569374d0e9a296ec48d3b34e0fd55
font_01_sfnt_off0001073b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4D 17160 bytes
SHA-256: 8ebde520949d5cf510b0c923b428c8fc98fb93f7658466e45449ef5f570a2b5f