Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bfef20e052936a8…

MALICIOUS

PDF

83.6 KB Created: 2021-08-25 17:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dc07bae93b752c72ba67713a78237008 SHA-1: 83d25ce0b0020dbf9507eed158f4aa55e114211c SHA-256: 0bfef20e052936a808881dbe024c6e980d71a6a80e3ea0bb82be7c7e6dce1149
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users through these links, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://oniceh.ru/uplcv?utm_term=dishonored+death+of+the+outsider+steam PDF link annotation
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/fb665b80afc5d1763df6134cf7963daf/4423110734.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/3df6nnqj1t2nbfe87ka5actml2/nibibis.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/i26bdvteor6b6o1o1ionrp34o0/88772618707.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/wamaroxa.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/53369731017.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/on7b673un6miesigt96dd3nt3h/48213351858.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/d8umcbq4gpghcon85s0es90bbm/ruranefopumopo.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/divev.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607df5284f94f---15511333378.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/94043954099.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccedb1ae03---vuxigezo.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd57971e4a---42852702520.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/44527358182.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/61943341371.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde17882e7c---xojawonugunagiw.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/50755193975.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/bideneke.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/68766964267.pdfIn PDF document text
    • http://fullx.net/files/85337012673.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee576d6ca0---dimedezunokewala.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b802ef4f4c8---30978148336.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/50916363789.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/repinopekovumi.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_off0000e1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F1 17304 bytes
SHA-256: 4383e2ff85311ef6ab127cc19575d8d1028cf22b2d54d88e54c77afa2877c2a2
font_02_sfnt_off00012737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12737 10676 bytes
SHA-256: d182aa9786671c2d9da780e47e60af8af1a75dadd3ff28f5ba07637e3fbe7996

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