Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f57886d9996b95…

MALICIOUS

PDF

74.6 KB Created: 2021-09-26 17:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad0d97c3dd2cbb6b0b63f7de1834aae8 SHA-1: 1483fd7a1e7d1e885cbb735fbc9caffe1378b3fe SHA-256: 18f57886d9996b95e15f235a73cb5bffdf9ba765862b5a1d05c7bd6ecee899ec
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the presence of numerous external links strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pistant.ru/uplcv?utm_term=jogos+dificeis+android
    • http://luluscafeonline.com/uploads/files/gibam.pdf
    • http://inarchengineering.it/userfiles/files/kumogefefuloruzivoj.pdf
    • http://lasermedia.cn/userfiles/file/walopurobedifas.pdf
    • http://prakseologia.eu/userfiles/file/reloxelapatita.pdf
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/52572045548.pdf
    • http://missteenqueenuk.com/userfiles/file/86044147447.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614c6f08bd82e---supox.pdf
    • https://didacostruzioni.it/userfiles/file/19229597934.pdf
    • http://lerucherdesanges.fr/userfiles/file/xitepuzumiwe.pdf
    • https://hzautomatisering.nl/userfiles/file/67821518.pdf
    • https://deltarealestate-eg.com/userfiles/file/wuvevibapekunotimetogu.pdf
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/83520070013.pdf
    • http://foxgraphics.paulsfashion.in/files/63939019634.pdf
    • http://lehnerkom.de/images/uploaded/file/45013405511.pdf
    • http://khyljg.com/uploadfiles/files/62582029578.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148fa5ee33ac---55617942079.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e362a15e51---mipovab.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f85c3e391d---88462594044.pdf
    • http://paroissedementon.fr/upload/files/31671947931.pdf
    • http://twgo8.com/uploads/base/files/202109181828387963.pdf
    • https://cingenito.ca/upload/editor/file/31242748480.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be1d.bin
df39c7ac911afe5c07b4ff72932269e017fb634504a1314fcd874eff9c5f4def		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1D 18280 bytes
font_01_sfnt_off0000ed4b.bin
fa81f800c60b01daf19cd61614f3086f563f4c37b2451b2ef7a103a1ce5d0c53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED4B 10500 bytes
font_02_sfnt_off00010517.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10517 16792 bytes

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