Malicious PDF — malware analysis report

Static analysis result for SHA-256 a14ec856255038f2…

MALICIOUS

PDF

68.3 KB Created: 2021-09-15 17:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8d7b6b991e8dd51124971b3e01fc7ff SHA-1: c81972c4b532937ea380e886f3f1f7f4e18be20c SHA-256: a14ec856255038f211562abf6a3848b46cf3d668ea9266326cec59d9f1b43f7a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only content and embedded clickable links, a common tactic to deceive users. The numerous external URLs, many hosted on compromised or disposable domains, suggest an attempt to redirect victims to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing campaign, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://oniceh.ru/uplcv?utm_term=hitman+sniper+assassin+android
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/c24d04a87e74df0fbbd966aa59e56afb/40649988310.pdf
    • http://kleinschaden.expert/userfiles/file/digegamiwakorukuxilemupi.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bca3a3eccd---50661729086.pdf
    • https://motelandratecuci.ro/userfiles/file/rajex.pdf
    • https://charlesstreetvideo.com/userfiles/file/mimubunomulolevuwavejir.pdf
    • http://vitanova-cattery.com/upload/file/solefaviwaxilerorenizu.pdf
    • https://prawobrzeze.info/userfiles/file/58325012722.pdf
    • http://fruitsad.pl/images/file/2726017820.pdf
    • http://rwdwebwebdesign.com/img-aim/files/62013962731.pdf
    • https://xn--interpeas-r6a.es/upload/files/jinokipor.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccf39f00c7---mozozazupazomone.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/fc8591bdffe8b1e46236032ed0aaf454/pilegosamuxukubewinozi.pdf
    • http://yingtailong.com/upload/file/21091210364895854893cnd0ue0lic.pdf
    • http://fsnmmaterials.com/UPFILE/userfiles/files/89264274876.pdf
    • http://vrajacreation.com/uploaded_files/userfiles/files/38874333178.pdf
    • https://perfecthospital.net/ckfinder/userfiles/files/94190859437.pdf
    • http://dienmaythanglong.org/uploads/files/24965260226.pdf
    • https://dbhattacharjee.com/ckfinder/userfiles/files/59069117783.pdf
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/ledivebepoki.pdf
    • http://robvancampen.nl/userfiles/file/nasojegef.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/109587c269158d8ffcc5b44a8d08d7a0/kuximovatumad.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/e663c276e8dafbf68c54811f0bc3aeb2/61868989313.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/binudokapezisazonugoke.pdf
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/31654782803.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_off0000b1f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F4 16792 bytes
font_01_sfnt_off0000ca06.bin
9963c36f7ff0819ac3eecf41b79fb2a9c7c9db21f03b138c6d546e729aa7697f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA06 13688 bytes
font_02_sfnt_off0000eba4.bin
4278ceaea1c7cf5f5b67f929d1d7c3818367e0e94676b9d3002c2443135f68d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA4 10500 bytes