Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e64674318d4fb9f…

MALICIOUS

PDF

98.5 KB Created: 2021-07-23 23:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6b6a567b998b61689ae5db6cfc33cdbb SHA-1: 9b4ca0b6fc389fb23dea94fa5a0b26e751e7da98 SHA-256: 3e64674318d4fb9f4d82b6c0a52753ef440f113df1b25242a8a111691e060832
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/ladotuviradudojajaso.pdf In PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7fdf3266ca---fidofumujufaduto.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/32309772146.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/100953923960f20a1d03e50.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/dujuda.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918d0174cbe---pikidolezu.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/90054372045.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097cc76b829c---36827969806.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/dejozopiz.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/61127269014.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/zugovuxa.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/1a8122febf007374af6f7c30467db425/sogaweragibajaxox.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/fc1e0eea3c35a3b7772c9bdcfd78ccf6/kivefed.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081003e1041f---39934270612.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/fanamudedibalokiboz.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/zelamubuvadirowedilapo.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/f84scnd9mkobf0sv4r7jcjm15v/lumikunaximili.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/guxugera.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/570a7f0727a4b73f85dcf56878d8c074/93120153357.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099af3be0bce---90691320292.pdfIn PDF document text
    • http://jessicarossitto.com/clients/7/7c/7c16b8c799dae9ffcd1258f31d6ff645/File/74862151142.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/34546868398.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/53f88c4487f931402db729bfb7c651e2/67115905617.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=libro+de+sampieri+5+edicion+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13383 18480 bytes
SHA-256: e4a19301bca2fe84a11062a2c636464ef1adc00a2b9dc6a46ae8b712ac5f3ded
font_02_sfnt_off00016314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16314 10868 bytes
SHA-256: 9cf94273ab3ce47873eefc38d382c40b3da3f635454f28af40a61cc499a993f6

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