Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf564c2da0c6df19…

MALICIOUS

PDF

82.1 KB Created: 2021-07-13 12:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a88913c6cdfdf99dd4dfe731a44ae22c SHA-1: 7ebe63bbfdb3fe61c0b4263cc59b78511f1d78da SHA-256: cf564c2da0c6df19ce98a12446e1b5c925be2df036518d5302eaee399d221611
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or malware delivery attempt. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a command-line context, a common technique to bypass security controls and execute malicious code. The numerous external URLs, many hosted on compromised CMS platforms, suggest a link farm designed to redirect users to malicious sites or download further payloads. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://nomylo.ru/uplcv?utm_term=can+i+convert+pdf+to+autocad+dwg PDF link annotation
    • http://studiotecniconuti.it/userfiles/files/xixaginufura.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/vogudeka.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-21/20210621125329832475.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/0419c762dba2192db7a59ec506e0698d/40484299525.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/21873961569.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/7122d27371fe2fc663456db0d9cf352a/49406418205.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a542d89b23a2664b36ac2d235ed2627b/depupuwiboxov.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8be469d9d1---gufuko.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/bizitinojo.pdfIn PDF document text
    • https://datajournonepal.org/files/sonuxakezot.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/o375v4phv00f9hgoetnjqodte5/15945877527.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c32717958a4---49374562347.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/fqohnvbod9lpt6fhpdg53abclc/nozujisutuxetejajafe.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/59706355165.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb74fd4313---masorowex.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/2a0385e9ed8ff271646a23698b063703/2525674765.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/gi1727k5n918b15rpddropnmma/36889537379.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/36320094582.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/34675822454.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/58706fd5d2966b492d24337511bd1101/10163574419.pdfIn PDF document text
    • http://beiks.info/public/file/63237795738.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_off0000dd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 17144 bytes
SHA-256: 1de9a64859be3c0dd9c9dfd80a00864f1b0999f698829efb8fe1ff9dd672d03e
font_02_sfnt_off00012216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12216 10864 bytes
SHA-256: 938ec10cd017c95b555b7e60bc5ae60bf5d1081d91d0b22e08b995eb41e2b620

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