Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd89935eab7806a…

MALICIOUS

PDF

87.1 KB Created: 2021-09-05 15:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8aea5fcbfaab7bf2d270d124501e9ec3 SHA-1: f21a26cb8a04a767e8007ca78a42030b83c85cff SHA-256: 6fd89935eab7806a65107ea33923c984329da8123b4b4f80c8b32bea5af99232
204 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised WordPress upload directories, suggesting it acts as a link farm to distribute malicious files. The presence of a 'Password-protected archive handoff' heuristic indicates the document likely instructs the user to open a password-protected attachment, a common tactic to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://catamma.ru/uplcv?utm_term=extract+pages+from+pdf+without+adobe+professional PDF link annotation
    • http://3e-recycling.ru/app/webroot/filesfiles/35742590255.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/sexezodi.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160929dc960352---wojibudidivibakojo.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/58153187874.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a6f24f236---vedatifowenolipabi.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/60a132c865b85b47898c6bb69b5688c6/darewo.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/kiwawukakonamebipa.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf6cf6f875---lonobudufupoxe.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/85066079125.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/ca6940922d2b8eb070d82c5b49c432d3/91333577452.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb50ce7527---67934848186.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbcef8e192f---85378181287.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/mutesirejegup.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/9b38dea7da9a003be67a2753f4bc7e8e/68126542752.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/45810394462.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/87759545211.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/53413254679.pdfIn PDF document text
    • https://turbooto.vn/upload/files/3662782067.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1a78f317a---lavagujapedelipevazuvuz.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/judisujejamagizowif.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/dilabatavujerizodok.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_off0000ebcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DE 18424 bytes
SHA-256: 41d087b90730d64601f351b6a0b804dd5ed459fdaf89556a5b21a6285073620b
font_02_sfnt_off00013381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13381 11476 bytes
SHA-256: 722dc155d4f2cf615ad79e68b10bd0674d48b77842ef91fc469d219bbddc3d73

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