Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c638c645ee2a7d7…

MALICIOUS

PDF

84.4 KB Created: 2021-09-16 12:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 402f031b1691bd2d1a76cf602dadd1df SHA-1: d07ad1aa9ada3e004313ee2eaf3965f05c72a4d1 SHA-256: 2c638c645ee2a7d75f01368f771c73d6464a5a4ea28307f0698897c58b2645f7
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The presence of embedded JavaScript and a high ML classifier score further support its malicious nature. ClamAV also detected it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=comment+faire+fonctionner+une+application+android+sur+pc
    • https://fleuriste79.fr/ckfinder/userfiles/files/22041364919.pdf
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/9855915093.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613eed0cf2676---22645934830.pdf
    • http://pharmabiosolutions.com/filespath/files/20210916081126.pdf
    • http://lesen-und-schenken.de/userfiles/files/fadojelax.pdf
    • http://hanboo.cn/Uploads/file/2021090306122870554.pdf
    • http://www.azurwelcomeservices.com/userfiles/file/tesuze.pdf
    • https://faktxeber.ru/resimler/files/daniluz.pdf
    • https://ikuseikyokai.jp/ckmedia/files/32288296569.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16141e5e5807f4---10293525222.pdf
    • http://e-motyle.natura2000.pl/imgturysta/files/16970401003.pdf
    • https://webtechnocrats.com/upload/file/10285101883.pdf
    • http://mizuho-co.net/file/ck/files/vafulaboj.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f66ea2594924aa5be80d83fd63e3ff00/jorezosegulovemilegono.pdf
    • http://carraracucinecomponibilitrapani.it/userfiles/files/26605812869.pdf
    • http://birizgardenhotel.com/userfiles/file/kufevimuvodaf.pdf
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/bitavegal.pdf
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/fagafuravoruj.pdf
    • http://yhbinternational.com/userfiles/file/dusopuji.pdf
    • https://milsagliksen.org/upload/ckfinder/files/makatumazunowafitikozo.pdf
    • https://g4m3s-4p1-12s1.com/contents/files/tizezeforoxovonujodisin.pdf
    • http://ativn.com/upload/file/jejunofusugero.pdf
    • http://mebelhotel.ru/userfiles/files/24917424730.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1191e0623---tidolazaxikapejibafigoju.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_off0000df27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF27 16792 bytes
font_01_sfnt_off0000f739.bin
b1ce38c4e7a38effa40b9842ae11ad7e6ca6c8aada734158548899c155e91ea8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 19532 bytes
font_02_sfnt_off0001284e.bin
8dd8a4407b217d57100cc5dece7481a8c2d1e8589081ddaf96532be3554fd703
pdf-font-stream PDF embedded font (sfnt) at offset 0x1284E 10912 bytes