Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6075a3ec440d6b…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 03:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3372f2c76e9a9cb82b83c37f3282407a SHA-1: 25b6cb5c93cafb5a48f9eca6a6d99d7d9422506c SHA-256: 4c6075a3ec440d6b2f2c70b81efe7cf4746bd9a021238ba6f591bf31b4e60eec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The `wkhtmltopdf` authoring application and the nature of the URLs suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5762

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://huntic.ru/uplcv?utm_term=live+football+tv+free+app+download PDF link annotation
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614074f682143---1629707323.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/vazipevuwagixefepedos.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210910/16312761945765.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/rokagoboze.pdfIn PDF document text
    • https://agregadoschucuri.sinecsas.com/ckfinder/userfiles/files/kuzovamola.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/58232281914.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/jogujitofupopit.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/xiviz.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f515b1a350---68420410936.pdfIn PDF document text
    • http://ttc-investco.com/img/files/fujovafap.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/roratavakifazozivosigaza.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/jofevefirug.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/narotadoduko.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/26997100684.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/6ee293a1b3a7a94f36d4003270a5f96b/81187336219.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/68532425819.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614f8f4cc6358---72658385153.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/tikugaromizegejosoludor.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/18931744679.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/kuruwoxanitexezeluk.pdfIn PDF document text
    • http://vhz.cz/user-files/wujewuko.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-13/20210913222214736064.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/cee81fcd2b10d65e6ad4ababcdcca2f7/xirixiwusima.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/gugigo.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/jikatofuf.pdfIn PDF document text
    • https://htmlpanda.rockeit.com/userfiles/file/dokenepatesikevotob.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/61831185834.pdfIn PDF document text
    • http://rapet.hu/files/23158691500.pdfIn 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_off0000b8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10D 16652 bytes
SHA-256: 8700d315c23647972a18aa6a2b139990298d135620c2e8f238941870eab2f15d
font_02_sfnt_off0000faa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA9 10572 bytes
SHA-256: 302083ed6ca48955eb2d153395b08f15df867f40deb2a4229e76efe6f276652c

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