Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fc0dd2f3efc41de…

MALICIOUS

PDF

68.5 KB Created: 2021-05-03 04:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1dc9f18305c43652fd4b0e25aa6eb87 SHA-1: 3b8f2835d36312e3960ce575651871111d72a97d SHA-256: 2fc0dd2f3efc41de34e177c987f8f2488438ee14e5efe916ba254934f9e1c835
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised websites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://amoy-art.com/Upload/file/doloxetazamekegokaxopofem.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a25e5be57---duwaba.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef1793dc83---dugobis.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/a6a98f0310579c88913fef332fb6669e/petijozaxaroratesufotedap.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160790f7635d8c---76342715960.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/7omrf7judj54p1vmd1m3bp4meg/83509250261.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/0u9h3rhr76nr92sms4l185mhfo/kibuk.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608592e9e5541---55970384666.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/1d713e72a2000139ef9de77dfb0c167c/34231337609.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/23808ec9be6d41b9b59a5d83682c5da9/11704477456.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/3955d9950c2fb67924b1a4103a4ca46d/xopunorebakejupo.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/loo4t59u99tasr9l1epra90dn6/26672762831.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/414967964bd5a381e3e9f1b3b8f28b65/2717697338.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7789a0683---tavegoz.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe9aebaa7b---13964093441.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ambulance+siren++song
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf32.bin
3e5446abd4fa5c78c84d5a2f17c1082a71a1c9a74b91cb82d90eefcfb9083fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF32 5248 bytes
font_01_sfnt_off0000e0f2.bin
70b5463f9ff26092f88ae1ed5da4967c5befe9e697ed810d0609d27e7dcf722b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F2 10668 bytes

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