Malicious PDF — malware analysis report

Static analysis result for SHA-256 de3c6fd9625cda28…

MALICIOUS

PDF

83.8 KB Created: 2021-08-17 09:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1c64d09d3e2643b04cdb969b7c4257af SHA-1: 5db2b0f80791f272415eb4e21b919c83b8477a66 SHA-256: de3c6fd9625cda2821a85a9ad259fafec6a0693de9ff9b78a01088b3d0b7dc53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a tactic to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm on disposable hosting further supports its use in a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://behagi.eus/files/galeria/files/xozijuwukaxigiseb.pdf In PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b754ec0b46a---muximuzisonuwurekadirar.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/kgpca7njnga24muu07djhli0m1/jelosi.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad623c8c703---zinupexiwenodegizusomebun.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/11889324607.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f74bec6c1---48236984910.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160fe9b124888c---49413278248.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d40b8de58---giwunasopujola.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/55065975552.pdfIn PDF document text
    • http://kasargod.net/uploads/file/gexarerutopagujilubisu.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/dd82r0uc8ajsasjh77egrgqds4/sepufekonasaz.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/40881943377.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8c1e3e538---pedaniruwuvorak.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/91615504031.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161040075eb95e---41472392991.pdfIn PDF document text
    • http://elm3rad.com/file/vifanakabatexaxadapewu.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/napipuvewawujiwe.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///71194736757.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/87340090846.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/25062897033.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68bd93cb64---49255950726.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/f8dcce965f43f8421331f7dbfa4e5638/tubajagamexerakife.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/88173273942.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16116e3058bbfa---35068942537.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/74474069562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=what+are+your+strongest+skills+and+abilitiesPDF 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_off0000e26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA81 10964 bytes
SHA-256: 63ef78e46c24c410871a03843ffadbbd214fbfa1c2af5f4722ec75fb2dba379d
font_02_sfnt_off000113b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B4 17416 bytes
SHA-256: cda34725699a7d844ac938b1ae6c635cbc6fb5fa392b4876308d5d50c66b18b1