Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd00f77f30e66d4…

MALICIOUS

PDF

97.8 KB Created: 2021-07-08 00:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 736c8977170f6f38b13be8ba3d3a3aca SHA-1: 73a8a790dd2de3f12c0997025f8968b2fbf1e16d SHA-256: 8fd00f77f30e66d43184305c0b090dc33f3ba6806c2445d64aa8a128e491eaeb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The primary attack pattern involves directing users to external sites via a link farm, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://drafthe.ru/uplcv?utm_term=stressful+events+for+students
    • http://bizbecho.com/pa/trainstation/uploads/image/file/49000118942.pdf
    • https://nada70.org/userfiles/file/wevogarejeninawud.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/6e89f892d3d40cc2cb2e51998229d7d1/44262232742.pdf
    • http://zae.me/datafiles/file/fuvosijojiritodu.pdf
    • https://askisan.com/upload/ckfinder/files/minewexuz.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a861a288f---dijol.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/55b11d2824c19a6887c0029c427c6849/xofekudozozidivi.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed9798fe5b---xudaxezikenomokelor.pdf
    • http://www.contectrade.hu/fckfiles/file/23222702684.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5a33089278---82900442973.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/9028cb4f1b0cc9cdbe141a6c033f33ab/31491341954.pdf
    • http://teplospectr.ru/images/files/34222616320.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a406a575ea0---59174331392.pdf
    • https://adamant54.ru/userfiles/files/runutotojudewesirakuk.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9562e7116f---63056713539.pdf
    • http://luingpyrex.cz/foto/Image/file/81721963328.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096094d64403---73615765186.pdf
    • http://fotofolliasanlazzaro.it/userfiles/files/lidujepis.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be92e7b7fef---82083147211.pdf
    • http://vaness-sens.fr/ckfinder/userfiles/files/23237886159.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855bfb80d7b---gevadirafovela.pdf
    • http://abwingscolley.com/uploads/files/68583016415.pdf
    • http://businessvaluationapp.com//fck_files/file/36718112290.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/domuzez.pdf
    • https://stopserv.ru/files/file/soseluxujofagubilu.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_off00011e15.bin
db1b98f52aa401edbe28976913ea5f32e61f2257100da91eee0d58cbc58c2512
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E15 10336 bytes
font_01_sfnt_off00013593.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13593 16792 bytes
font_02_sfnt_off00014da5.bin
b0609871d9e23bf83f39e20e41d20e42274b47936c9312bae3791bcf6b169ad9
pdf-font-stream PDF embedded font (sfnt) at offset 0x14DA5 16944 bytes