Malicious PDF — malware analysis report

Static analysis result for SHA-256 d675356cc8e0653c…

MALICIOUS

PDF

77.1 KB Created: 2021-09-17 10:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d417569920e5dc9f7c96c744d5ea5b1e SHA-1: 699f89cfca4311c058564fef672b0e9dc21ccf48 SHA-256: d675356cc8e0653c913513ccaf6a914466bae66baac343e0d79086bc44a5c221
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://nomylo.ru/uplcv?utm_term=dua+for+a+mother PDF link annotation
    • https://dp-engineers.com/admin/userfiles/file/4237760903.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/kopux.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/nuwonipugixuvokoduma.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/1aff61f4e9aa458eeb8667605d4fa85f/50366200868.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/modojiramonizugejekoxa.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/41575778462.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/totifopazum.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/60987800112.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/vevuwuxufed.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/85007014950.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/14377765431.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/gulijevirexod.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/69288623104.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a252750d0a---goduvagavoxikup.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/lutepegezitafulikiwe.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130176368fe7---meminidifarowododudaj.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390a59e8e24---fadumanotolukekagitezige.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/mukifewowexoxonejodir.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/vatadazijufofewapifemel.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/zugiluwomosapobun.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/solinefasebubenewugido.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/lutepozipeg.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/wekeximobepute.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/25071306368.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/dojubotekedemikime.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_off0000cb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE383 10172 bytes
SHA-256: 525eeb039918226661758d50d7eaf0622f98b61122b149a417c336e2097ab803
font_02_sfnt_off0000fa4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4B 17376 bytes
SHA-256: c80bef1e0d42004c4904dcac36242f063ad815e8b8fc6d65eae0783f3cbcce2e

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