Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4b510deeab835c…

MALICIOUS

PDF

136.7 KB Created: 2022-03-12 12:01:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-04-03
MD5: f168215d8f9a87caec8843b582989ffb SHA-1: 3e09949bb4033ed8c477bff023e20f4cb7ee7370 SHA-256: de4b510deeab835c82430433696e187c11119441c196db0719d7863080c6fb0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to PDF files hosted on what appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is entirely composed of these suspicious URLs, reinforcing the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8679

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://ccskin.com/geektic/files/xafabofo.pdf In PDF document text
    • http://angarakshaksecurity.com/userfiles/file/wetizomewatabu.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/b3b912d393d109e6c68f9a98ad390054/gumolupime.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/14058312720.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/tizetelinerazipuleno.pdfIn PDF document text
    • http://visoda.lt/ckfinder/userfiles/files/30251595655.pdfIn PDF document text
    • http://rosspeed.com/kcfinder/upload/files/bufewejalesaxikav.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/80447010971.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/91001281777.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///bopigofovimigofakifekube.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/h784v9j7b8jt75pdnbdhabqab8/18552549006.pdfIn PDF document text
    • http://demo680.webbazaar.com/uploads/96632446798.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1620c4a58c311c---dukerixenudajevifejetipu.pdfIn PDF document text
    • https://p-yanagase.gorakuou.net/blog/upimg/81904676101.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/vemurewenoberusegita.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/fozovesonamupalufasin.pdfIn PDF document text
    • https://ongnuocdenhat.com/upload/files/sefefapozedawiroxupepiw.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1715377736621bebbf9c61e.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/42047c33445dd39f7772699f8b963746/bofiwuruxe.pdfIn PDF document text
    • http://7treehotel.com/userfiles/file/rofomozuporifevogasiz.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/65718618795.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1622723ebba70e---vowugazituziteripoxodi.pdfIn PDF document text
    • http://partynfun.com/kcfinder/upload/files/zusujo.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/37783858081.pdfIn PDF document text
    • http://snc.easy-event.net/img/uploads/files/roxudo.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1621d5e9d4d40f---9192666111.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/59891601929.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/wogakowukodu.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/nunelexa.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/xadiditukuzenebudi.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/tekiwanopipenamenifixof.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/41199069790.pdfIn PDF document text
    • https://fecuq.co.za/XSRYdR1H?utm_term=black+t+shirt+design+template+vectorPDF 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 extracted file (font_00_sfnt_off0001b9f0.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off0001b9f0.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9F0 16560 bytes
SHA-256: 924ad5cb737cfd9a34472b2046831991df4d3950e5f0d7b552a18309318c2ee9
font_01_sfnt_off0001d110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D110 11172 bytes
SHA-256: aeff618542721d83aee7a73220fffdbf9ad0d144f5468760895a11e788860632
font_02_sfnt_off0001ead2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EAD2 15668 bytes
SHA-256: 6211921cf0bb51b39a33f371132bf55dc9c75abd765e287458d7c1053cc0b180