Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f57f608c110f84…

MALICIOUS

PDF

76.9 KB Created: 2021-09-01 16:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e265f693f5d47e795e621e88e320fd31 SHA-1: a9a7650291e55f9f44ac902da5a0feffc672d4dd SHA-256: a6f57f608c110f840da9fa25e8db0c71b74e12cfeab19efd00a09c558d631518
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised or disposable domains, a common tactic for phishing or distributing further malware. Heuristics indicate it functions as a link farm, with ClamAV identifying it as a phishing trojan. The ML classifier also strongly flagged it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://medvor.ru/uplcv?utm_term=what+is+the+difference+between+loc+and+iloc PDF link annotation
    • http://sxhk365.com/uploads/file///ramupitizig.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/nikovasexenekokibiluxukux.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/sexipuxulovepu.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/gesajowixorine.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/furebedikeniboxuluta.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7ca049e81---78666074444.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/gamofotugilexit.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/675386360.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/madifarawepubaragitutira.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/guvikimemujiraxurufubawib.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/siwawejopemexikatodajuga.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e75099c7cb---jizade.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/ruroxefitipedogajexa.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde01327e17---pugerapox.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e65fc2edfbf354d6c20a362e27b0ae63/41520978047.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/tozomemegijavu.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/fekavebaxuwe.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/rumizipej.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4fa6e5461---49731479981.pdfIn PDF document text
    • https://electroagro.es/pub/files/tiwirixetidesumunirimi.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/gababot.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/2a43dc67bb44dba60c920bb08e3b48d2/35381231130.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/du23a7115ela5m3hgjs0l2n8hq/watunekirutofit.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/22864668795.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_off0000c3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FF 10792 bytes
SHA-256: 97e19297461f60d9feb4c2be574fa0c6331830a90d2063dd41c10ad3fadfc2cc
font_01_sfnt_off0000dcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EC 17532 bytes
SHA-256: f2572b5e500a1d8fc2878bf90ec0934307e1754b7c85d2f0f2e38d76e44005e1

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