Malicious PDF — malware analysis report

Static analysis result for SHA-256 864a28401a71d289…

MALICIOUS

PDF

93.1 KB Created: 2021-07-02 03:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2dd06b5077dcb3287f8bb567dd45e6b3 SHA-1: f19b7597d284b49fc98206f13e295c8e1a90a7ce SHA-256: 864a28401a71d289b6b8ebfaefacbe317af85081bd8875ec424dff37bf1682da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to potentially compromised websites, suggesting a lure to phishing sites or a distribution point for further malware. The presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving spearphishing attachments leading to malicious web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://medvor.ru/uplcv?utm_term=ethical+issues+in+bioethics
    • http://homenet-spb.ru/userfiles/file/13808106110.pdf
    • http://goldway.jp/upload/board/file/niwadukovidokegup.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16070038f7a764---85800152662.pdf
    • http://kanchanaspa.com/ckfinder/userfiles/files/xikadefatixivenotemiga.pdf
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/89513794764.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4ijuvi5pb0rchvslfc8tkqqulk/97081087729.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/e8asfmdlgn2lqeapi1h885llm4/gibuzetizuvabumudex.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910123c2902---pewol.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ab56d31a1---jupuvosuwagal.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a854c882979---xasiruwewumar.pdf
    • http://voijin.com/userfiles/files/72753297869.pdf
    • http://alpha-th.com/userfiles/file/58111737215.pdf
    • http://gourmethousemacau.com/UploadFilesfile///barewukimurot.pdf
    • http://assushop.com/userfiles/assushop.com/file/49082151008.pdf
    • http://cualuoiskydoor.com/webroot/img/files/fukidavivixosuwul.pdf
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82746091300.pdf
    • http://supermarketdv.ru/files/file/vegomobepaxoxapodimovu.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/219569385500cdc813cefc95ae16eb08/siwukofaripu.pdf
    • https://teyadegitimvideo.com/calisma2/files/uploads/2011016081.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094489deeae8---dolupewedel.pdf
    • https://nnkcreations.com/userfiles/file/42665615352.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/29d652ee6ae1f7e3ff03d97dfeedad0d/37404906638.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/hh9m0qj3si9tg9jb1q18c2t9bn/viborubasogevasumugat.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/a1b2153325e61f09b92b43b9e79bd23c/nogiwefuzakazowo.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_off00010b34.bin
1e3fdf99f440559ed4adc4963e555c8480189bd1385ae8909ebf4adfafce62b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B34 17088 bytes
font_01_sfnt_off00013790.bin
e35d1ca1600720a22d04c4cf36baf7c561e08d4b668991e12d30daf0b1683dac
pdf-font-stream PDF embedded font (sfnt) at offset 0x13790 10448 bytes
font_02_sfnt_off00014f39.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F39 16792 bytes