Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51163e0c878f00b…

MALICIOUS

PDF

85.5 KB Created: 2021-07-10 14:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2c672e495d2ce54ff451354bf64682d SHA-1: d23808ed63d7623ffd17d834dd5367f36a5b5c07 SHA-256: e51163e0c878f00bdd60b571c19060731046d5c1c27141464da37e87eaeb54ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. These URLs form a link farm, a common tactic for distributing malware or directing users to phishing sites. While no scripts were explicitly extracted, the nature of the embedded links and the detection signatures suggest a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89dd939c51---78380657730.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b4ffca497---16175930955.pdf
    • http://szentimresiklos.hu/upload/file/gopamanivelasazololaki.pdf
    • http://zahradysnapady.cz/soubory/files/vuxufubuxafadugi.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160da36705836c---26737077862.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608871c71e7a1---guwotazemafinipamarog.pdf
    • https://annjulieskarpmo.com/userfiles/file/88302364774.pdf
    • https://planet-pvc.com/upload/files/kotagamexizuwital.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/86cad0d846646e81e2eee767f5c63977/23328370238.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/a9d679bd671ba8f3530fb710f0c6bf1f/21911814206.pdf
    • https://erdemlerkoleji.com/resimler/files/buwitizumizu.pdf
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/jomuvopaxogiriji.pdf
    • http://oaklandscreche.ie/userfiles/files/zezixukikalafalovutidozo.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/817035be8c700e7fc67e912ca94fa451/tinagopiguxaribujo.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/n0nonep8oqnk5i2vjpap7plc1h/77890047902.pdf
    • https://bbpartner.cz/userfiles/file/42822142699.pdf
    • http://restravel.ru/ckfinder/userfiles/files/joguj.pdf
    • https://unicon-msk.ru/data/files/66706989178.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160964c63a5e96---35294894506.pdf
    • http://hndgyl.com/v15/Upload/file/202162848232182.pdf
    • https://nhaccugiare24h.com/uploads/userfiles/file/94705420013.pdf
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/e44daa562523916e2c52e1a207f55510/43227233112.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/f64fe9f3cfb5cde2b62efadd4fbc07d8/nefozetosada.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59b0b14436---61280487984.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/d25490998035d3d190d5123762c9dc2c/bupoxogaperedujetu.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c056e5f1a0c---63893875723.pdf
    • http://nadiadsa.org/userfiles/file/52121731534.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=types+of+speech+in+english
    • 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_off0000ede5.bin
288c16942af81008192f407ccb66cb0d87a8012a19289812285700cbcc5e2d25
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 16476 bytes
font_01_sfnt_off000118ad.bin
aa7a05fa4e4329a03ec82cba337b98d1756a247d90e5425080d6ff0fa1378e03
pdf-font-stream PDF embedded font (sfnt) at offset 0x118AD 10476 bytes
font_02_sfnt_off00013071.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13071 16792 bytes