Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef120d9970584e2…

MALICIOUS

PDF

105.2 KB Created: 2021-08-13 21:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: efb485dd68d9894a55cec708aa5d6656 SHA-1: 0495265d51d0da53bfd913767fc2837b710e03ac SHA-256: cef120d9970584e2d75162cae9aecce3f5f3cd913437f43a166e7c0034e5861c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://ashioke.com/images/library/File/48893138651.pdf In PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b496643c16a---96485996104.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/falunajulinajelutavaso.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfffeebaa03---buwedogo.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/pulijupukutirorupel.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/cf6e84dafa8f607ed051afaa07c068a6/zexaxedofakem.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ee52f30ea---masakasonibemimeruka.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/worevelalakuduw.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/xopunufejenopewof.pdfIn PDF document text
    • http://kotolantopeni.cz/file/taruveveb.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/tisila.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/30888476348.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160714aa229ba3---rewofisakox.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/8d20a627a5720f5a0656f66f17d2c741/57035917370.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/25260634515.pdfIn PDF document text
    • http://remobudostol.pl/pliki/potexomi.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/47740229339.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e05afc87ecf7b7913d242d5156638d3e/nitakixoposolijexetarik.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/bbc346ce2d9fe54d9a33123d20677cee/vufezisopilazonomipe.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743a4740949---timelivebogak.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3ca6036c786cea34c36578036ad6e0c8/xejavinesexurisavokodusef.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac87c6de022---damusenimaretej.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/75199001444.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/51cda57f1bd7cfa87b31a3b42d8a4fb9/wirafozuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=%C3%A9valuation+frise+chronologique+ce2+lutin+bazarPDF 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_off00012ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DED 20412 bytes
SHA-256: 79c3ef918c71ca0171bf1febd9663bd3ef0d5aa9a350f8f98760a3002070d992
font_01_sfnt_off000161c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161C4 11248 bytes
SHA-256: 17b685745a7709afb3b0adf637350449fad4c8496706e6e28f2e2beeb0d9c4dc
font_02_sfnt_off00017be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1