Malicious PDF — malware analysis report

Static analysis result for SHA-256 42337fd02ccdb358…

MALICIOUS

PDF

74.6 KB Created: 2021-06-08 08:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f80d468f52a2abc90d793bb86628539 SHA-1: 6f872a36e5a0c9da38ead73b91e1b1383b9eebb1 SHA-256: 42337fd02ccdb358def4deb8594444e9cb70e77a1a99f16376e510da9b2aec9b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though partially corrupted, contains text related to unit conversion, likely a pretext to disguise the malicious links.

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 https://archism.ru/uplcv?utm_term=como+convertir+de+centimetros+a+pulgadas+formula
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/u90a9tgpf6gpb4gffbt86o0rir/66196770377.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160817ba91b429---kigedu.pdf
    • http://www.emailposte.com/pictures/67361671307.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4944274d19---32711150665.pdf
    • http://arci-mp.fr/admin/File/gakaforebanuzaxaku.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/8ef31222c1b7d81ad91275a66cfe2db4/sunexidales.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089d06d739de---80567266425.pdf
    • http://etcad.net/np/upfile/file/20269842784.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16077741a85cb0---4861869336.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd8b6e2426---janifenuvoxalazenoga.pdf
    • http://beytarimcilik.com/admin/editor_resim/file/71449366418.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/v4877kr0mvqi95a1j1tq0t1fj1/92123298133.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db6a.bin
f7de447f3eb0686ad1052cc94985b2d818142eeb53128837c2ce712b6a3fdc93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6A 2912 bytes
font_01_sfnt_off0000e5d0.bin
4ce7a5066524e552e64ba67ba8bebfd4480f18abe2979e3ea41aac9203519aa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D0 5440 bytes
font_02_sfnt_off0000f83e.bin
3604eb9f0a8ba2afbd7aff99d3b5cec9a56153e3dca0e65d76e7554f3a986037		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF83E 11176 bytes

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