Malicious PDF — malware analysis report

Static analysis result for SHA-256 c06a2792d3351628…

MALICIOUS

PDF

72.0 KB Created: 2021-09-30 11:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3e57ab9953be2201f52b1bf5f8a47548 SHA-1: 830fa76eb61d05bb7be445d55c63ce87d073b054 SHA-256: c06a2792d33516282ba22a228a32a3ae43189d799a36b70d0af6d144491c05d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream, which is a common technique for executing malicious code. The high number of external links, many pointing to compromised CMS uploads or disposable hosting, strongly suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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 http://flapboxes.custompackageboxes.com/userfiles/files/32806078437.pdf In PDF document text
    • http://titusauto.hu/kepek/file/zabigobigikumumolav.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/6803045253.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/71172ad9313f88d67c5bcab531923af6/42429172266.pdfIn PDF document text
    • https://cartolmania.it/file/22878384186.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/17341517242.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/85970869025.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/bekenis.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/1727603235.pdfIn PDF document text
    • https://kristinanamaste.eu/files/leduwotufozim.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/rojudizufepisote.pdfIn PDF document text
    • http://handgun.ee/media/file/nelopuxukobitasebekozet.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/hvec41hor16bbrgu9m1kaj6pb5/jerolifosinoses.pdfIn PDF document text
    • http://baoveantam.org/upload/files/64920295434.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/14114230142.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/nasujafajikaxe.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/30326198873.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/26274046760.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/satogutotinaw.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/20219291359483804.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/tubojukiwapaxotidi.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/19a0531796a6bb355adb305587ad8e0f/vuwifomararopowulexe.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/37091930448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=death+chase+3+frivPDF 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_off0000b5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F5 10404 bytes
SHA-256: addc731450a634a354c9595d1184738304b901cb2d239b7fc597beebcffaa6d9
font_01_sfnt_off0000cdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D7 16876 bytes
SHA-256: 2868026ca04d609a34acadba59fc0177ff9063dd2042a47c32a109b3659e864e