Malicious PDF — malware analysis report

Static analysis result for SHA-256 72fe7b3d44019b95…

MALICIOUS

PDF

79.4 KB Created: 2021-09-08 21:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7fe1f75c387a180d2ea36b5f9a20f3bc SHA-1: db695388ac62fdd85a0caecab77cfcf78faaeb53 SHA-256: 72fe7b3d44019b956cbf95ae2355f61ea010c8f65bb8a80925f2c34ef927f731
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. The presence of multiple links to potentially compromised CMS upload directories suggests an attempt to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://canphantich.net/Images_upload/files/36594229638.pdf In PDF document text
    • http://unseenadventure.com/userfiles/file/21831611713.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/40632281204.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/98608163109.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/xebivafokolepur.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a303aa527---46362769187.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/rupuxewog.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/dulazevevozufelele.pdfIn PDF document text
    • http://mayjack.com/upload/files/jifumedamosumofujetidiko.pdfIn PDF document text
    • https://brod-plovdiv.com/images/xuxavenasonosoj.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/bavakawo.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/45284038520.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613278b61788c---jegitakawajafijawikibin.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/71870553888.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/wezowunevasasasefo.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/zevasokaxi.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/63185898249.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/musarimupuzemewuvaxe.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/1052979807.pdfIn PDF document text
    • http://didopack.com/files/fujuviro.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f22b613268---bemavatedowuwu.pdfIn PDF document text
    • http://sergeybazarov.ru/file/jisodibulojafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=finite+mathematics+with+applications+10th+edition+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_off0000ccf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF2 11024 bytes
SHA-256: b43d99bb9ffb0e71bc82f14467ef99acc5a9e45a3e30a28af7d9dedd57c33098
font_01_sfnt_off0000e668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE668 18872 bytes
SHA-256: 7bc953ffa782c2a7597909020d0d19080a1a24c08e5be2b17e5a215d8efe270e
font_02_sfnt_off000117dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1