Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f7c00b426a58bd…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 08:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e448aefe2c63af0099e5bda4fd703a12 SHA-1: 0fdc43cd72959e8431fb11ee2eb2414e200d23eb SHA-256: a4f7c00b426a58bd7035ee354573780ef42069c56f03e5c2ce0be55831a67c50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, including one pointing to a compromised WordPress upload directory, and others on disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=m%26a+term+sheet+pdf PDF link annotation
    • http://interreg-ipa-husrb.com/downloads/53062368117.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dd949ed16f7---49456876685.pdfIn PDF document text
    • http://bienbao.org/uploads/files/lotazebalunu.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/6655999482.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/tunikatuzakoni.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103b37d968cf---nepuvajoz.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/relogilukakafusezuzud.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/melotutijigumin.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/jigadi.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/vomiwo.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/qpj559ckfq13jsc5h23qrc3b19/pugufoguwilukipuzaf.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/70464652302.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/b84580eb4628687d3c973ff27ee6f037/rapiwaxugesadelofajobimon.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-7-26/20210726020446542441.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/50234884562.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16077273d44d47---85521933926.pdfIn PDF document text
    • http://berbun.com/user_img/file/panezed.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/obozivaxok.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305a498bdc3---65633713595.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021071304503980554.pdfIn PDF document text
    • https://papiratisk.cz/soubory/kixenameleranilabatorex.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/6330451c7b8938201dd14f1017dbf788/38772063428.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/samasirubofoma.pdfIn PDF document text
    • https://giustofiori.it/file/51022458239.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/14427248124.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_off0000d4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E0 23304 bytes
SHA-256: 6b2e2530239766e8f23c5b36254b37bba720a19b2e432e6f2903b944bef9062f
font_01_sfnt_off000110d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128ED 9068 bytes
SHA-256: 0c5dc90c3de47cffa0504e1bb228b014d25b31b00ac4265d3cd1e9712d82adbe

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