Malicious PDF — malware analysis report

Static analysis result for SHA-256 0377b3ea15c11399…

MALICIOUS

PDF

84.1 KB Created: 2021-08-19 11:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fd1eb3e8dd98690b909695fcf16de4e9 SHA-1: 8274c5bb44932e46a6fe7a1cbf1e0151088d06cc SHA-256: 0377b3ea15c1139957f87d070e7f023edae386b9b462bf0bcfebfbc48275820b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely using spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://sibconsulting.com/contents//files/9693767525.pdf In PDF document text
    • http://unipsyclinic.com/userfiles/file/20210509182103.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/nocsrl99c9me3lkhnb6m7qnncn/feladaberatejivadolob.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/70953139665.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/rorisegawubuzap.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/7880381192.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/912f2879bf682518095c5c25284285a6/19040302473.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/974ee787c72e9e03df6cd2ba09db239d/raneregupuvu.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/73789583471.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/21429925404.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/walowodo.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160af235e45f98---52367272277.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/jefuzalubokikov.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/42830092163.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/lerojeluxo.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160cb097267ba6---lulelonixesu.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/71144779199.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a5303c30d---1476854047.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/kawagafetutagumowomaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=telecharger+cl%C3%A9+d%27activation+windows+7+professionnel+32+bits+gratuitPDF 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_off0000dcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF2 11784 bytes
SHA-256: ff2bd25946922d0a6189fa415b60cc2cfce8a28fb9570d269792aa2fe9dc22c4
font_01_sfnt_off0000f890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF890 18396 bytes
SHA-256: 9fdf7cb7cd4acf6526790797d1b899d9cef8c5975ebcff83e7af43d0c540350f
font_02_sfnt_off00012733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12733 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1