Malicious PDF — malware analysis report

Static analysis result for SHA-256 c60732dc2d9f06f6…

MALICIOUS

PDF

91.2 KB Created: 2021-09-13 02:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6b47836027801eaf4861f3ada4bfff10 SHA-1: 414797bc087b7c60b116dcde3cd38a71e31c0e9b SHA-256: c60732dc2d9f06f6fa3290a1b3f3e799166da103b0de22988537b53e5a2c9da7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but serving as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://amgaa.org/temp/files/zimonobagujijejavuxuw.pdf In PDF document text
    • http://svatba-emi.com/uploads/pages/files/59259770595.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/xefubijum.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/totekufesuner.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/84520996920.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/majed.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/31380415543.pdfIn PDF document text
    • http://quangcaowebsitecomvn.xemlaco.com/uploads/files/97356849209.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/59832022909.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/93746501442.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341cf20fa53---xalivuxovi.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/9167800007.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/47812292538.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/dojene.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/fiwexepoj.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/59b072942e6bb04a6036ff10ee4d64d7/xezidosajudunubodesoton.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/f2942010f24a976c73df1e62275afebf/vadelefixipo.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/dosigodogevurepemem.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/juwotemubiwajubifuza.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/66885796093.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/donurotoxo.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/setigabu.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/botamubopazakekasava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=filmyfy+online+moviesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10374 17228 bytes
SHA-256: b3c2bab181d70d945d7a30358350d43265ff6c8a64b052cf9311e73d15f28e48
font_01_sfnt_off0001301c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14833 10172 bytes
SHA-256: acd2370b73d08f815063994ff4fdc89614140bc3f816a25daecd56b1c1fb739d