Malicious PDF — malware analysis report

Static analysis result for SHA-256 4020b9c986cc84bb…

MALICIOUS

PDF

83.8 KB Created: 2021-06-27 11:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44eacdb4610f41fca8c089e497c5eba4 SHA-1: 2f77d575aeadf07daf01444d2330b4b8176fd5a8 SHA-256: 4020b9c986cc84bba2318b2e18f3aefa60b2f6883d3b9a58c3909ebd4acd422c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, and the document body was unreadable, but the presence of many unknown URLs strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://a-kamen.com/userfiles/file/dukagax.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c719e04ebbf---5021016111.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f7ff6e046---24431868388.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607de3f2bc55e---bawerepodobu.pdf
    • http://kursadowicz.pl/Upload/file/zokujekadexemewubemiveb.pdf
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/937e8416d8f63b6a3479dc81487ab6d9/36190968120.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608adfb2b1ed9---subebiroditegesuwawajiku.pdf
    • http://artecgroupservices.com/imagenes/file/sapilonaxenesar.pdf
    • http://ms-beauty.com/ckfinder/userfiles/files/mefeduponi.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/d0fc579277213d2e2af7011c43a19835/tazegi.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dc8615f0b---8380811621.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160742cc955d75---47366774656.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a37dc88c60---89691550129.pdf
    • https://bbgpiti.com/userfiles/files/berepapisikirufisuwuw.pdf
    • http://meta-min.com/files/fubomuvoziga.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f46a05a845---gifej.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/9rb2vk1v8udq1q4eb471llkpcf/jijirep.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae946a90d3---luzebobubuputulag.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9d4f75ef1---84158574470.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a32a16b66d---vafavemimuzapazowe.pdf
    • http://csc020.com/userfiles/file/20210617124155_iadrtu.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c24b14bcf---vovemaxed.pdf
    • http://wagnerfamilyreunion.com/clients/866685/File/49029824864.pdf
    • https://aawyx.com/sites/default/imageuser/file/basejidilopexekatupaxod.pdf
    • https://circolodelpistone.ch/userfiles/file/tugisop.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=example+of+hyperbole+about+love
    • 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_off0000e37e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE37E 16792 bytes
font_01_sfnt_off0000fb90.bin
61a95af9c46c793b69f0a9a174d16df011b687f3aef27774cfc0785096bb8c83
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB90 17088 bytes
font_02_sfnt_off00012796.bin
a23d7415c5d1f411bea81be8112a43134f4b3b2f85c30ef64eeb7f3b94375cb1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12796 10764 bytes