Malicious PDF — malware analysis report

Static analysis result for SHA-256 01f0c52ef55cf73e…

MALICIOUS

PDF

77.8 KB Created: 2021-06-29 11:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: adcb0334c5da7399ccbece1b35561322 SHA-1: dfb1bcc8c6fbc2f7c8556fbcc8111e25e4e0b4e1 SHA-256: 01f0c52ef55cf73e5cbd02b7f21af035710e51826b889c645d2cd500537dd551
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=mental+health+section+117
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8e2117a1e---70484175054.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/3jgpaopkg6osg0k4aclougb2j6/99655823807.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/d182f852285ea4d6b5651cc4cb553cb1/67264676802.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/jggsj31lvmllo8v4pjqlte6erc/vudojatabipigepizomej.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/53941e89ccc7795769a0fe1a484ce72e/89935098828.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/50400b72a3c0ba8104b309a2746e8971/49013741791.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/93ce90cd2b60a2b5d50ee722c937aea7/42762577988.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/46da3d525857eb38a22f5f10bb3ccb17/11256942115.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076bfd7cb59a---tiwokiraridotexutuwar.pdf
    • https://ancoraeducacion.com/images/62812839081.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/609693edde2b4ffe61fb3332dc7ae220/31220855144.pdf
    • https://cuacuonbentre.com/upload/files/pinaxodibesubukulivesoru.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa08c45e6c---sijekefasaxozigekivisala.pdf
    • http://a-swiss.com/upload/userfiles/file/42525148214.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/b0bcee2dea588d8c03f20a470f3be07b/sowabole.pdf
    • http://veterinariomauracotti.it/userfiles/files/misetukabi.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/6a3cabdb8270f3cc342cf38d428d1713/29284337256.pdf
    • http://softwarefactory.nl/images/file/3563999382.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d80ce455a---92600611308.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0fcecd9fd---12551134950.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/i0lc6i21u97hs4n7p6sirv1003/42406059378.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3aa6b0780---25976459910.pdf
    • https://alshaabcoop.com/userfiles/file/kodem.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe02b941f0---86039002593.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d041.bin
f4ef60fa6e9b293487c820c4c058361834fc8531bf44bb51683ac69326230ee8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD041 10320 bytes
font_01_sfnt_off0000e792.bin
d6128b70ce7213f27ea18f08687cb6a6557ef0ba058bdf5dbd8fcd8c032d0fcf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE792 15960 bytes
font_02_sfnt_off000110a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x110A1 16792 bytes