Malicious PDF — malware analysis report

Static analysis result for SHA-256 935a5c83e3192132…

MALICIOUS

PDF

94.1 KB Created: 2021-07-02 07:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a175370b75cd2b7e208b647bd5ae5e26 SHA-1: 15f2f417aeacf20f5a14cf7860446909aa8fbf51 SHA-256: 935a5c83e3192132f09bcf08b8f12961539fd2055d0bd768d71d0db7785b928a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The file contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the overall structure indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/8901cedd3f24447977b8655148da30a9/sabuludafuxu.pdf
    • http://hud101.vn/webroot/img/posts/files/24299705807.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/4dup3pbm6kfg3pjj1hd8bhdn63/gukuza.pdf
    • http://easyreturn.store/userfiles/file/29385142710.pdf
    • http://chhsclassof64.com/clients/b/b2/b21d6454c74b38f294a67049e63db9d7/File/79986635096.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/010130e57e429a0321fa9da2f15ca57a/10148640164.pdf
    • http://hissekurban.com/resimler/files/57694870593.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093d46f5ceeb---20327521881.pdf
    • http://alumcity.ru/userfiles/file/lakijavapesozokusimutaw.pdf
    • http://prime-standard.com/piceditor/file/9930394604.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b9bd7cde7a1c44c4eb356fd132aca91c/71582579633.pdf
    • http://zonwering-nederland.com/ckfinder/userfiles/files/xefineximovovu.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f73d92cbc6---81489746947.pdf
    • https://infoenergie-loire.org/userfiles/file/gawudusupuxozuzunixi.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160872098495c6---98463186496.pdf
    • https://al-farh-iq.com/upload/userfiles/file/93284508336.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8eb94a6ab---binatoxapomabujotozu.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae54c661fc---ruzof.pdf
    • http://stellar.ru/ckfinder/userfiles/files/65912138949.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160786f2b3369f---pewufalajepidunexux.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b71fd7741---35844075473.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8926c24ca---175363550.pdf
    • http://expertsystemgroup.com/file_media/file_image/file/suvatomitirorowajoj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=writing+a+research+paper
    • 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_off00010e59.bin
46a522886f71b08e5a6ab660fc7b453d1784509158f5a5737fe5e3a9f37c9cc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E59 10480 bytes
font_01_sfnt_off0001261c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1261C 16792 bytes
font_02_sfnt_off00013e2e.bin
f860c4b5af80a149d74e5a7c28b318f7605189debacd7222dfb72e762f84c8c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2E 16768 bytes