Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a3136560cda4a3…

MALICIOUS

PDF

92.3 KB Created: 2021-07-02 10:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a124e13848fb92b6f08852c985caba7 SHA-1: 0d982ffa9faa2dcae44036916656026396077ee7 SHA-256: c5a3136560cda4a34775f48338a737419c55b49080bda5a176d491f6e5c3e7ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm or redirection scheme. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of these links suggests an attempt to direct users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://mileschapelcme.org/clients/9/9b/9b85db73e8c1d5ae3bc18b6db4f26039/File/suxewizosezikor.pdf
    • http://jkmdc.com/aversystem.com/userfiles/file/26474550054.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adb3007246---15191232755.pdf
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/53752707860.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c6d8d77ca943d2a2f2450bdfdc45db16/joxafibodamuba.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160badd7488604---27190404036.pdf
    • https://stdtekstil.com/upload/ckfinder/files/63178584003.pdf
    • https://nutrishop.in/ci/userfiles/files/lomebebipewazarojaxi.pdf
    • http://yoron.net/up/files/zemarutevul.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089dbe7f4103---81831507756.pdf
    • http://dienlanhlongan.com/upload/files/56686057613.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c65cfc566c0---vugetigavixodavi.pdf
    • http://bogelaipigeon.com/upload/file/96812522391.pdf
    • http://musorcentrum.hu/files/article/file/gejunabawara.pdf
    • http://kaowei.tw/image/files/20210605_025820.pdf
    • http://rotarylaspalmas.orgdocumentos/file/6285885001.pdf
    • http://vladjurnalist.ru/archive/file/28536519651.pdf
    • http://dilimkebab.com/userfiles/file/57214821932.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/e8876305b055c1609a285676769cced0/59323726800.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d21750de8---fenipamojufozizoxuranok.pdf
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/73416846670.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa1c5388a3---gowunogazivitif.pdf
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/81412331867.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=history+of+western+philosophy+bahasa+indonesia+pdf
    • https://doi.org/10.37680/qalamuna.v8i02.357
    • 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_off00010494.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10494 16792 bytes
font_01_sfnt_off00011cab.bin
fa5ee601b9efb7491db7bc24d9c6d0d0b3a4e5f1490bb56c7691bfa6bed4f46b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAB 10924 bytes
font_02_sfnt_off000135b4.bin
255afaab3605c68f38278313cd39951ae7f1279accf933abe69045cf1620105b
pdf-font-stream PDF embedded font (sfnt) at offset 0x135B4 17336 bytes