Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27d9e8da2457416…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 01:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 26f45b40b32e757bb9f37d09dcafc498 SHA-1: 86b14be35cf3d5389cc1775b28a6c661394e85f6 SHA-256: c27d9e8da2457416692377dea77e6c8677f8f4f59e7d1d5b01e2b2093a913226
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The 'PDF_IMAGE_LURE' heuristic indicates it may present as an image to trick users into clicking. ClamAV and ML classifiers strongly indicate maliciousness, with the ML score being very high. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://nomylo.ru/uplcv?utm_term=image+combiner+android PDF link annotation
    • https://mamo-tato.ro/userfiles/file/5862258573.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/jetoda.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/25129060118.pdfIn PDF document text
    • https://yakin-surewin.com/media/file/vezozo.pdfIn PDF document text
    • http://recrute.fr/files/files/jegela.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/kovuvaxolifiw.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/70516896372.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/98931679159.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/96540135317.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/62804913700.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/geduk.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/86181892392.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/bfoa7gr5pct0miot6p39rus84h/zuvonefumivofanexuna.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/19310294161.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/39336556201.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f0c4ea49e1---zawanekokokaw.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/kibobidulorit.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/mesaxogevejo.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/170528094793.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/22398472423.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/c17bd7646a3a083014f44ecef6782cc3/47277970986.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/weluwedosanilo.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/68226789319.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/76773252649.pdfIn PDF document text
    • http://petrovaskola.sk/userfiles/imagefile/93128551080.pdfIn PDF document text
    • 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_off0000b24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24C 10492 bytes
SHA-256: 879cd9f4da04ad39792528ab4fdf73d567d98fcde1fe208ca803cc82b918a9ca
font_01_sfnt_off0000c9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D3 14108 bytes
SHA-256: 24cf90c18d4261aef7d66eb6541c669bdf681f817fed46615fc4b6d805eb0ba9
font_02_sfnt_off0000ed09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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