Malicious PDF — malware analysis report

Static analysis result for SHA-256 a231eb1ef6409ff3…

MALICIOUS

PDF

75.8 KB Created: 2021-09-04 12:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 506a2f50685151ff980a04c8d3f2a0f2 SHA-1: 089fefdedf8066c9b9dddc5179df26576d34c3c7 SHA-256: a231eb1ef6409ff33966dee6aff87ad6665ba8d9ffd729c1e4d340ddfe0133f6
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://queure.ru/uplcv?utm_term=adjectives+comparatives+and+superlatives+worksheets PDF link annotation
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/41614503687.pdfIn PDF document text
    • https://ahha.az/userfiles/file/44143721065.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/jaletosajone.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/30286097293.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/b1cab1630f958c6ac8a203ae8fabaf41/77459011030.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1624860274.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/zojopadozujetinatixo.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/d6b5b910d3e3950a6b7d3c41963e6bb2/64737136927.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/81406443235.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/34690289533.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b107b7ac7ba---54469869832.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfac5ea96bc---wewizokeze.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/6p2fci4a7edde1k90ppu183tnq/tovaduxavulufeliwer.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/dodawifuzisuvajemimat.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/toveporajiliside.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/90561054284.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/427945bf6816ceefda7ecfc04693e009/fubosikakujaxo.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/95547281610.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/gll45gkh17tcjlu3l6khr2pjo5/75907356643.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/polefesotuwusoles.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/3b89b0d1b73fda064c9c3733f7601429/79938945143.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210814025639.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/41202303920.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/punivuwoxipefopalosaxira.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/61154836826.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c585bccb4b---zamubudosemuj.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_off0000c4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F3 16196 bytes
SHA-256: 9c7af1a1a9fca74bd5262f54042c43f18a72613dc9f01b11f7d67ff2a9704ea2
font_01_sfnt_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001069e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 11236 bytes
SHA-256: 50f4530651144d49e4b882b1e6fe76633d6a22674c7bf47e182efb67d4831a6d

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