Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ad5ca6cbfe4fe7…

MALICIOUS

PDF

99.5 KB Created: 2021-08-16 05:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0c892b24374ee24ed775561ac6a55c0a SHA-1: 8121292a2fe412c55ea56ebb1a87084d5635b93b SHA-256: b9ad5ca6cbfe4fe73b7980ba8d50a59a9a9b81179ae963f8d3f704faf19e660c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://inwebjor.ru/uplcv?utm_term=how+to+see+torn+acl+on+mri PDF link annotation
    • https://dialogueinpraxis.net/files/docs/66499363544.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/laxixoriwaz.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/32229785738.pdfIn PDF document text
    • https://castel.ro/userfiles/file/76736500021.pdfIn PDF document text
    • http://planbmedia.hu/files/jefanalikakesosamoviv.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xujifagurifuxijazatago.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091504157f0f---60284407660.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/jrfesmqp7b0eetsibqfgm66prc/bofidesogijukozuxonibi.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/42316660194.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/navagobo.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/zadodidurikakopisalen.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/tefukujibe.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/dasekevemuzu.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/pekugixeguze.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782a00e67d6---tozoker.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/nogurujebasusitik.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/1b73b8af5cd78e5f82b65088e83187a6/27229554345.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/99650383976.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/c83a2e703b39750e1aa58f39cd7949bd/kitanuxexikewunaror.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/merobimadulimigovurasaz.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/wunavafajajajip.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/fatunisaxunexerajotokub.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/kokibivavizis.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607643222f0aa---26855204676.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a317b2121d2---22862866196.pdfIn PDF document text
    • 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_off00012482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12482 16484 bytes
SHA-256: b2f55e06795d4630e8525d4cba27d0b1161f4dc2e55495cb88d8532ae715a997
font_01_sfnt_off00014f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16748 10468 bytes
SHA-256: d6d9d853789031917d53685ab0d4c9818001e2bbcbcb4f433fa5e8420dca6144

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