Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa727b8107c4736e…

MALICIOUS

PDF

87.6 KB Created: 2021-06-26 00:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c027eb1e3a18ba980e4e23e1941d2e32 SHA-1: bbd12286f84f58ae5734aae317af6815a74b1439 SHA-256: aa727b8107c4736edd3c6815bbff726e8ff0a7e8d4f09bd584fe0dbaf1c359c3
156 Risk Score

Malware Insights

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

The PDF contains numerous links to potentially compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/siniwejefava.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/591ef9e8380da5199d5d1a9138ff1a8a/mulesuniv.pdf
    • http://highendschmiede.de/highendfiles/file/78456984545.pdf
    • http://homeopathyhk.com/files/8559235039.pdf
    • https://alianzatours.com/imagenes/file/87527394773.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/848cf650dc592d5e96b4f44d09d359f7/23094260878.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c4df5d42ad8---11432487290.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0e6f2c740---zotulanidodado.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/bd703627e4537a731a12aa59e40af9b5/xalewamu.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608343ee2eafe---98401653648.pdf
    • http://parishad1925.org/ckfinder/userfiles/files/giwemefikawupuzus.pdf
    • https://tmtteks.com/files/40902961677.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963d6275495---46214389811.pdf
    • https://agrimal.pl/userfiles/file/nunofuvokadi.pdf
    • http://www.agenbenangbandung.net/file/83106523263.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c48d034a83---tepamudarafojafilifew.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b574bc8c7f8---jewelenediberamareviwugu.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160779f6d7b90e---37262011187.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/63013801960d5811c6810d.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c462208b069---32498675249.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/4ef5734b9f113a6f9ed7140f289d17f5/kigos.pdf
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/30116342250.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d90d178f28---43445045974.pdf
    • http://leakefamilyreunion.com/clients/63964/File/gimesapatojoguxadoxogudub.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a488d35916---gupedawinewugujufa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=excel+problems+and+solutions+pdf
    • 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_off0000f223.bin
67c21fc00ff8c9caf433bb595ad4fb1337ee73320721a37e07a753ef48ae51a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF223 17420 bytes
font_01_sfnt_off00011f76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F76 16792 bytes
font_02_sfnt_off0001378d.bin
5d392798c3948d9c1ed3ac990398c9ae2302e4a4cee039ab807afe89c7e0bd17
pdf-font-stream PDF embedded font (sfnt) at offset 0x1378D 11108 bytes