Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca661cdfbef8b790…

MALICIOUS

PDF

86.6 KB Created: 2021-07-27 15:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 771bdafd2ac2848681fd21f6ab58b76a SHA-1: b62a4b41bd68a64a041db4f110d8dc7cbd3062ce SHA-256: ca661cdfbef8b790357bd79514289d754f4def4e099080032da46953716d21d2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5940

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/tg8jm1kc52rn136nffkf99sjm4/46018093182.pdf In PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/59129107244.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/30021959266.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/21321821733.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/mogamezalu.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/77190768258.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/92205520552.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/0ec9059ab03ac1a13574c4342af32329/34758389727.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/rexusebemotafepuniv.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/vakojusupex.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/266eb4751a2403232136bf599129c88f/dewumetorikexaki.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/jutijizosojezeneti.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf13428dfc---59622622885.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/786f059e976f104d13d54d32450d0605/17461290387.pdfIn PDF document text
    • http://jarosi.hu/files/file/kerakopuxivinolakefiworif.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/62000442273.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/pilavibemafi.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/cc6h8ftvfg6fl8mq4ka6cmn687/riwefifukutefegifepixup.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/77627420466.pdfIn PDF document text
    • https://shibbirs.com/media/files/43407396055.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/3f663a14cfa1c37e8c789ff460d0c814/58418701252.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0c656c10f---gusavowonadiduwi.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/a113dae04e8aa47dadcf5270eb754020/10800664432.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d77e4077272---30206223977.pdfIn PDF document text
    • http://maryamghiasi.com/images/upload/files/ramojaruximelun.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/demese.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fc2d2fda0---94679608191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=subway+surfers+game+for+pc+free+download+full+version+for+windows+10PDF link annotation
    • 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_off0000f8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B7 11620 bytes
SHA-256: ac0bf815f1dedd586d30747c2814b0f34fcd2e542a5a7d42ed9662c6812807e0
font_01_sfnt_off00011402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C14 17360 bytes
SHA-256: d8bc5b998de968fafa544928ac901e705b1662b024087c4003a38522008b7c57

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