Malicious PDF — malware analysis report

Static analysis result for SHA-256 77cac5ab18cf7eea…

MALICIOUS

PDF

62.7 KB Created: 2021-06-18 08:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d016d23c57bd956a0cfc57a441a9ae92 SHA-1: 8e3cf7efcf22fdcf8dcfc0d6a8341d225021ce27 SHA-256: 77cac5ab18cf7eeafeaec2c5bd4cc4f1ac7d5a09f802a2c334d654f46d1160d8
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF contains a lure to copy and paste content into a command-line context, indicating an attempt to trick the user into executing commands. Several heuristics point to the document being a link farm hosted on compromised WordPress sites, suggesting it's part of a phishing or malware distribution effort. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607780cec0e30---manupuvefafoxa.pdf In PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160983c984f6b5---bopejidedifejizivebewiso.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/daeece26eef77165135663da29be4144/13697852769.pdfIn PDF document text
    • https://actor-conseil.com/files/file/43002123348.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/87754478387.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/76847505723.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/25099209290.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093473327e8d---lowemamopexolavawuviligaj.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/cle4u6de55bteioc8ha695s3lj/gidikepesa.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/08528b6ad7ba87fbf2eaf06994fc1017/kudefobotakunakepowaz.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210609_EA1BDA976F310BC5.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/gususatatawamilagokaso.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/6454dd3f75912f3d280759fbd5dcd938/xokiwulisakowefobisu.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/6628059113.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/16895353539.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0c62bec01---bejabaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=roblox+prison+life+scriptPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB750 5016 bytes
SHA-256: 2a5b888c20b1aaba7b74403d4d1b8bc71cd03a707ec485f3171ab514e5f0ba24
font_01_sfnt_off0000c87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87D 10620 bytes
SHA-256: 135d88e5c25d5516744c343d7dc9431e529f9ca7daec2bbc3ff1a90933e516e4

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