Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f4577aab39d0d3…

MALICIOUS

PDF

90.4 KB Created: 2021-09-06 11:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 22c6ab687a393790b3b1bd434020be27 SHA-1: a2eba607893d6f3ef7a67f738e0c723e205cb15f SHA-256: 94f4577aab39d0d36db4a0c3d73bc503c79b8e69c4651f22043f2942a7d3e35f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress upload directories. The primary purpose appears to be directing users to external, possibly malicious, content, leveraging compromised infrastructure for hosting.

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://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606feaccc39ab---38289170149.pdf In PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b28d84c0e8a---punejepavenutusurubur.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/bejivim.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/gezetomubojagusom.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210807_874B181733C228C5.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/sobaxododapivuliviwuroda.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/72595625244.pdfIn PDF document text
    • http://hzqzg.com/d/files/borerevutu.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161005b9f65415---ratuxedaworofagagog.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324c6fa22e9---51896725479.pdfIn PDF document text
    • http://funperm.ru/content/file/4957401686.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/46578329733.pdfIn PDF document text
    • http://eichler-kammerer.de/galekizeribuwafalasepagog.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/metodidumef.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/46535046013.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160ada9a0789ac---65658938216.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609011ef290b5---24670215531.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/futuji.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/52202267269.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/55335264094.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/fetazibuzigosu.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/44752679183.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/841e2c8c83a971675867fd4e4b6d0b00/tiwufafigarepoba.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16125999524f9d---38430887020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=mice+and+mystics+lost+chapter+cat%27s+cradle+pdfPDF 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_off0000fb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB60 17976 bytes
SHA-256: af77624aefae5852f9be5805c1d5fa6afca7d90e1ce3602b38ca990be99f016f
font_01_sfnt_off00012a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A37 11028 bytes
SHA-256: 2f80174ea21fdc556815692c38705e173dab66ac56989fc842ae6d6972527549
font_02_sfnt_off000143b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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