Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be1a44d75ba2c77…

MALICIOUS

PDF

79.6 KB Created: 2021-09-06 00:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5b9a9b7009baeda698e26d893cd71a9a SHA-1: 41cdffda5acadba6276c3a9ca6ce4a617d5c274e SHA-256: 0be1a44d75ba2c7750cabaa42283910100f5903ca91c4fe425572cf1a6c4c776
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as Pdf.Phishing.Trojan. The heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or malicious websites, some hosted on disposable domains. The embedded URLs suggest a phishing or malware distribution attempt, likely disguised as a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/19tfdfi8e4kdgscrh83q384145/foxagugadasovi.pdf In PDF document text
    • http://beiwendq.com/userfiles/file/27758295217.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/qhtkojavpmc2qoo284j30hs8e7/zapijukimogutuxafirezom.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/68391933417.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/nikorajefuvogelurujabiru.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/gopizisolejemapinisu.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/vijufe.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16078916dde801---72388789241.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/vspugb6d8542phoohj4etbng3r/21071894107.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/musasataxemajilawoduw.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/99359840821a929f13e027836092004a/kegisotuluxene.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/lekaviwa.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc36649eb2---katuvuvunutogunorizod.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/45695666881.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/bakidopev.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/zalunexeralutedun.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/57151664443.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4c3fac805---kenuxujazujuvadotix.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/mivatak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=sickness+self+certification+form+pdfPDF 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_off0000d273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD273 10948 bytes
SHA-256: 6856d6c8a116e51637d9ee1c9e1920907975294ed7f5770437a569681d4d454a
font_01_sfnt_off0000ebc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC1 17624 bytes
SHA-256: 0b0ea50284214b6a7ecd940fa198c08f5bfad7fa348c3abf817f884a00b4c10b
font_02_sfnt_off0001191c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1