Malicious PDF — malware analysis report

Static analysis result for SHA-256 0231888166698f06…

MALICIOUS

PDF

70.4 KB Created: 2021-05-19 05:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f156758dcceb15bb47c7be684288e504 SHA-1: ef66a450a9b868a065577cb4b00e81da671f3208 SHA-256: 0231888166698f06c03e48338ee0ebfe108c2ce41367aaef76cb4cfa0c53357d
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan delivery mechanism. It contains numerous links to external sites, many of which are hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure for free music downloads, a common social engineering tactic.

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://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/354c1ac69acbfc03f30d181ff4b5bc25/13388221465.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4861741fc---luvufawitujemiju.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160807281aff6a---44136397525.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/96efb79a39e573d9013ac75e8f6b05a4/jexizojinega.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/802893403907c97dd25081db44199a40/35649492828.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b4c935c59---gefoforuleforag.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2fada5d92---mibaludalakomomuja.pdf
    • http://progfin.pl/userfiles/file/88718351465.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160984c5e2a2af---43913110184.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/fe5g2hta91ngkp1h9v6ifhu6ap/lavikuweduzudameto.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/2ilgm7n1v9l53rf2fstt19lspd/72978251871.pdf
    • http://aarogyamedico.com/userfiles/file/sugakux.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2e234fe96---25579583686.pdf
    • http://mnogonomerov.ru/uploads/file/64147582508.pdf
    • http://fenotropil.ru/userfiles/file/46730441061.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=kandha+sasti+kavasam+mp3+free+download
    • 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_off0000cc13.bin
ffcb5d8710db842b3a5ae5df07a36b482c26a8fb10cc802eabcc1017449375c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC13 5416 bytes
font_01_sfnt_off0000de5d.bin
907beacc0066038e2b1e0bbe57e55347edc62f22eebce6efd93d99c8d3ab1e80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5D 9748 bytes
font_02_sfnt_off0000ffc3.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC3 4324 bytes

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