Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2e760ff3916180…

MALICIOUS

PDF

71.7 KB Created: 2021-09-24 21:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 00cd1c020844789e14c46e2f8f07f4d9 SHA-1: a7a5484be1f38fc01fea438083efbfd9701290a5 SHA-256: 1b2e760ff39161806fe924d7a6fa8f5070995c4c864f508e50e11c06651326b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to facilitate phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://jasmijnbloemengroen.nl/userfiles/file/33383530023.pdf In PDF document text
    • https://mallarpurnaisuva.org/go/file/redudoguvozaxorijejag.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/bolotajibibetok.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef84dc9f42---lomirejunima.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613643f150aa0---zelolowolimoretosewama.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/parubevusuxazum.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/d1f3ff4edf4624ef83f8d383d58a3708/nejuxosilowewox.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/21506096478.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/63026198616.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/xizopikutojafomuratosow.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/zomebedikepenaparen.pdfIn PDF document text
    • https://vzglavniki.net/data/file/82788817280.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/16305212606.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/xodiwubu.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/14dad767fb774114ca5a9fdc41de2695/solowatukarujufedukil.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/31582034232.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/bofozutebunogipakon.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/21961321181.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/lowadewiwixujizomegeluju.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/juligoninifapipekikavowu.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/4391321480.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/lukatutafi.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/galamiturupaxagada.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/41192265109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=download+game+jet+li+ppsspp+androidPDF 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_off0000b4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD09 10952 bytes
SHA-256: 2a53e1d6d6da1c7966e49d57145a265890949e0959c0534aff85f1ffd2a3f146
font_02_sfnt_off0000e62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62D 17128 bytes
SHA-256: de52388664c08bcb0497d90721f1bac863f887f28c1dd5509d410578a6261dc8

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