Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c91bb1e3ef6c45f…

MALICIOUS

PDF

87.4 KB Created: 2021-07-20 10:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a020f1d86274d2fbb497c0c3d5552453 SHA-1: dc7c802cf3d305fde8e64ed3e91e9e8dc8d9a08a SHA-256: 6c91bb1e3ef6c45ffb08778811a2e60c422c97929cf54236e0689c8b2568f99e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crocepadrekolbe.it/userfiles/files/30007101115.pdf In PDF document text
    • http://md-servicios.com/userfiles/file/kumoke.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab97eb3743---vidugulotijeginurofo.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/nutivimavi.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/5b09992009fe7383362a97956dc5319e/jowisevagurileku.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd450cf9ae---32895968461.pdfIn PDF document text
    • https://nexusmediation.nl/files/75407514775.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607086798b97b---dujojuvalafedesavalu.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e46873deae7---20543973326.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7add7b151---zapabekowir.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/dixotexujedeku.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077409d89c70---vemunurosejak.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/33953541558.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/4ldjl3tuds6u8dvgohu2d52aiv/fuzalegek.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/0257d9d83119455401527a19e717dba8/joguzenumidepokogetaw.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdc861871c---78159543539.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728e9121c64---93814239564.pdfIn PDF document text
    • https://hssanesteban.cl/files/topelusetuzidide.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/17485363337.pdfIn PDF document text
    • https://ka-base.no/images_content/file/12263153905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=find+the+area+of+the+shaded+region+of+a+squarePDF 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_off0000f2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EB 17328 bytes
SHA-256: 8329b05e8114210151d2a59de7116a28d199e2860909779b68be7ef28145042a
font_01_sfnt_off00012032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12032 10808 bytes
SHA-256: 671c02c724c941e94d6e0f6f4069e91b8169030973bb526f779a484760255969
font_02_sfnt_off00013883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13883 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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