Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b7f9afa13b4b667…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 15:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8f0d7b073dad4d19fa4a25656085045c SHA-1: c8712afb21eef2a6ffe1f7dc3bd13dbd01c6fc9b SHA-256: 1b7f9afa13b4b667951c9009d1b7f650f8d053492e7e2bfe8fb957823a4ef4e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=redeem+robux+promo+code PDF link annotation
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614360faac21d---kuneditek.pdfIn PDF document text
    • http://epicridesnepal.com/files/61898409339.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/22400549383.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/83555964868.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/807vrq1vpad5d7f6o05660saf6/33463941268.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/doxufobutitagafefuvep.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210902145254.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/b60b8bb8dfb3237e1669a565cb59b679/rosimosupoxesulox.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/zolomeritodun.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/7814922944.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/39266668424.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/67069876730.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/42389400789.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/dofirobunejugijuferuxezo.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161399b044d9d9---4008329447.pdfIn PDF document text
    • http://smirna.pl/files/file/rovitifedetifopujiba.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/janixujimuji.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613434ad7f4f8---10215143285.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/81661374713.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/jibexaxilowepirapa.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/74382089557.pdfIn PDF document text
    • http://dentali.cz/files/files/71640763134.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee0bcb4739---mekux.pdfIn PDF document text
    • 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_off0000d5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC7 10392 bytes
SHA-256: 8ba82fdfa444445585d30d74f15a2e39548e67ca9c8a3ab5a9a4bc78c8d25c61
font_02_sfnt_off0001050e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050E 17580 bytes
SHA-256: 9486dfccc691ff23a826b509b4efb4405e8e1e267ead368ae4105609f39469fb

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