Malicious PDF — malware analysis report

Static analysis result for SHA-256 041cb971304a9111…

MALICIOUS

PDF

87.4 KB Created: 2021-07-04 02:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b8fa0be6308cdacf3e855c26e76e647 SHA-1: 4a2a638dbe43c1238ede6435112d1c70f1c1943a SHA-256: 041cb971304a91114a9411a9fd82b75b412e522762bda3460dbb60cf8ed11052
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading further malicious content. The presence of numerous distinct hosts and the use of disposable hosting suggest an effort to evade detection and distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/79aca51bf4425a3151ee5b21a2f7aac3/fobosuduwemilijojulo.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7559027ca---77667263769.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f28192ec3b---95301811962.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c012bc3c05a---62391713380.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/4433c179209f7184efc446d45a773b8c/78369975817.pdf
    • https://mimpishiosatu.com/contents//files/dibodokajumu.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/74091369ab43b61236eacbe8dc720837/80151027473.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/66ffeafa04f9fd8d281226d01107a159/82438445143.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed1b9c013d---liwabunirezebu.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4f69ddea9---vemasurowivemu.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/657pbgr3q2fpbasq35p1o4cel6/jiluwajo.pdf
    • http://shsuorui.com/uploadfiles/fckeditor/20210612/file/16234841024019.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99c018b01c---bepabudojol.pdf
    • http://nemeckystrakac.sk/editor_uploads/files/19027191726.pdf
    • http://szolnokepul.hu/userfiles/file/12057403171.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/a1sl53ehnv0054n6t0oa8ra6l9/sirirewewu.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/4o40emnck885c9loe88637fesl/mipap.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160836ae33f0c7---kavelaboretesujejesono.pdf
    • http://firanywiktoria.pl/uploads/editor/file/bowobavasupu.pdf
    • https://dcoderesearch.com/uploads/71999870077.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/vesefemugesanubaxudox.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607358e7dcd4a---movefuriz.pdf
    • http://rudolphalexander.com/uploads/files/65029809973.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897bc2cc997---wuzapavajetazafapij.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/rnvg8dj0onob656ncdckucu61t/19562528318.pdf
    • http://chetaomaynganhnhua.com/uploads/files/xuvowodamerefimimam.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/e71d06da1eb9ce9773944d3f933ff7ae/64949365309.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=swollen+uvula+after+drinking
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f099.bin
66220ffdb87c1fbaa8c0627f2e632c1a46cd6eafaa7b06d3540e353bd99ac870		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 17720 bytes
font_01_sfnt_off00011f17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F17 16792 bytes
font_02_sfnt_off0001372e.bin
516395dc146e5ab4f99b3c20a6777f7449c4f430a71b64c885129a5931effcf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1372E 10780 bytes

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