Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9501b173ad78b00…

MALICIOUS

PDF

93.0 KB Created: 2021-08-20 23:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8943a1bb5defbf6a48f785ed9ea7d179 SHA-1: d15df8d996657b358c5f64ed827c66c3889344b2 SHA-256: f9501b173ad78b005c4c49060e953349269a8a09e3f669a440c1fa144ee0d1c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Additionally, numerous links point to compromised WordPress sites, suggesting a link farm designed to distribute malware or facilitate phishing. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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=what+do+you+mean+by+catalytic+reforming
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f2d4cdf62---wumegufoviwometosavigiwul.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d556cd0338a---robavifirotebik.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e779cd2b7---34208851874.pdf
    • http://daoltrading.com/userData/board/file/90683084355.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/9e4bb6f6580ae5cf605c360d32824936/vusibulunakimuk.pdf
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/suvazobipabano.pdf
    • http://baugeraeteverleih.de/benutzerdateien/nedidakonomekuwima.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f5d8157f0---noroxotexulasuxajel.pdf
    • https://vientangluc.com/upload/files/61913517642.pdf
    • http://abimobiliare.pl/pliki/File/galavu.pdf
    • http://shop-cartuning.pl/userfiles/file/pifalafotagidebudibefodi.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/77ddac0fd632c544e65c4805a22d8b05/tuwamivezedimuramaxupo.pdf
    • http://jshtextile.com/UserFiles/file///76327068720.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf42b262870---fetiwaberesuxuveso.pdf
    • http://simonide.org/userfiles/file/85971342160.pdf
    • http://colantuono.it/userfiles/files/betumobufokamelirigorimuv.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11f6a1875a---5631211277.pdf
    • https://gabinetpro.pl/kosmetyczka/krakow/files/291507506.pdf
    • https://mediaget.ru/userfiles/files/90551658724.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b868b5f69---xevuses.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/66876355907.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/dec316e93576dc5777cee0c0faf363de/kuwiteda.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bfe4aeee9---giropivetosakar.pdf
    • https://unitedfightalliance.com/ckfinder/userfiles/files/valeguguvisenej.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_off00010793.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10793 16792 bytes
font_01_sfnt_off00011faa.bin
495f96ba11603c3894cbc430cab70caad7f27c7944a7ee512adf199a1e9ddca2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAA 11104 bytes
font_02_sfnt_off0001391f.bin
da543361e3460cab919b74c0c8ea5fd0af4993fed6f25a54403e8c7a89a7758b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1391F 17104 bytes