Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca0af1a732fb787…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 16:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a5d4a83365afc87f873c7f067e1d9853 SHA-1: 2938a6fc0bda5fa72162f9c98eb370f38b0dc337 SHA-256: 6ca0af1a732fb787d884066c8fe1947e76161e91205310656ec3e80ea3576e66
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF file was flagged by ClamAV as a phishing trojan. Heuristics indicate it contains embedded JavaScript and presents a lure for MFA or one-time code harvesting, suggesting an attempt to steal credentials or session tokens. The document also contains numerous links to potentially compromised or disposable hosting, likely part of a link farm designed to redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.gullyracing.it/admin/ckfinder/userfiles/files/80355351568.pdf In PDF document text
    • https://best-label.com/upload/files/33445275639.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/0c10d3cda1b36f2bd12b7d99d0b3358e/bitinozizujarafubizujikir.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/52468740856.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/zarozivafivukeke.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/99862846701.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/tosulurajozew.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/39233147790.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/degojenapowibaduwotope.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/34264161161.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/85f2l6fuu6maq4ea20ve5l3iod/6270806102.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/0cf2d5b524e36bf3aa918c52b203b855/tizikiwij.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/6999691156.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/pufuniraxi.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/93165341451.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/77381688966.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109022015065929.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138dc7d944f1---ruwesiwejojebiribit.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/lerowuwusokisagag.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/wukedu.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/25135958483.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/ziledomowivedepugoloxu.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/37857727767.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/soxenedexewedisite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=send+pictures+via+bluetooth+iphonePDF 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_off0000d750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD750 10992 bytes
SHA-256: 456bbf955275229da8607e4db62917de01f5e455ce2955ba8a41678d692630b0
font_01_sfnt_off0000f08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001089f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089F 19184 bytes
SHA-256: 35444600f6c4658c6879a9d0f29cd425d0e8b6a9c99e09d260fc067c6eb188fe

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