Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c6c8c7838fc7f9…

MALICIOUS

PDF

75.7 KB Created: 2021-09-05 20:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f2c5dd6e0946b4d2b74a09c83a6dec46 SHA-1: 641047c337658d20eccfffe7975505943a0e1751 SHA-256: d2c6c8c7838fc7f9259e518a66f2665b8479c8efda454ac7dee300a3e683e7d2
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to various PDF files hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or redirect users to phishing pages. The presence of embedded URLs and the nature of the heuristics indicate a phishing or scam campaign, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/b87a00e311ca1b8ec697d7be7af789d9/xijeretukidepegesowewefa.pdf In PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/fagisolotexumezadutapod.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/6f5ff20073647be5fb905dfd9714d779/11781277783.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608faa8f5c466---21457430035.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/f5614dd072fcb84e11ab3f3c15d450e7/57991453774.pdfIn PDF document text
    • http://vswet.ru/f/jizeroz.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/palapo.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/vezetaviwatalus.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/6806916882.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210716143108.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a67382642---87379653843.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/iqlo2kg8p6nd5vre7d81l0ilo6/wavugeguriza.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/3788603220.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3660b96b6---45294465779.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/8537953760.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b8750fce641a0c2e5bbdf4f1dc3d3ecc/25977277245.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/72930190394.pdfIn PDF document text
    • http://ipllaser.in/uploads/wezepufoluwawurunep.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/jokugavotafup.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609411083441f---77909199745.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/84158339021.pdfIn PDF document text
    • https://fptica.ru/images/file/80160302596.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/38640311558.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160872098495c6---98463186496.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/ce6c2efdd71346301cb355628abdee7a/31493853707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=keith+richards+life+pdf+free+downloadPDF 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_off0000c354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC354 10796 bytes
SHA-256: 77c49255884713ed12c17e7daea3bca4e1788997497fa30f4cb76d5b09432f81
font_01_sfnt_off0000dc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF444 17312 bytes
SHA-256: 115882eec30794ad1831e8883d3fd9825301c6a5fe54eafb1ae3edf7c5be5723