Malicious PDF — malware analysis report

Static analysis result for SHA-256 cee4af8bcfa9afb9…

MALICIOUS

PDF

112.1 KB Created: 2021-08-13 22:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fcb1c8cf81c5c9c6e6bf4c7fc964e3f0 SHA-1: 4c66dde10c938cfcbd2c1f3b18859641e3fae2b3 SHA-256: cee4af8bcfa9afb9c2d1156b98b55ec38036ca79c4dfc89137561eb9519448c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress sites and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a phishing lure attempting to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/uusafea518mh9fn7uverh2sct3/33772211216.pdf In PDF document text
    • http://swaminarayangm.org/userfiles/file/dibixeputisaxaso.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/klau4aum4virca7c9pkei0dd4g/58008306587.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/wetafiduvi.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/21662099935.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/kijiwidefaxidoxurugaxu.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/92787759569.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/dujuw.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/21927763484.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/a021346a1b52bf6a5fb90838b1f1f7d6/55153560163.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2e21d4b27---42941530939.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/d23df61b222f57e167791dc3c7d6c2ca/56435767353.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/komemofaj.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc24fc6118---vunibovut.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/upibiivtoeuc75tqtrou903j7v/30645251921.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784f296c709---98989371462.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/fevurogubazo.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097f7b9a31cc---14276435250.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/atur7v8gd3gs0slaodmbso3s95/xazuxekubipel.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b788505cbd2---derexolivimefop.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/usvbkpdknjf71ju1lcc0qtpuul/malexupexuvutoduj.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/12221905545.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/77739093733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=sample+job+application+letter+marketing+managerPDF 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://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_off00015578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15578 17724 bytes
SHA-256: d0d7c79344baca5f277f54109c3120cb07635a95ea0ccf18c25956dc97619d5f
font_01_sfnt_off0001840a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1840A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C21 10988 bytes
SHA-256: 779a68a9e8e88d2907fde080bc7c9827462487e89ce8773bfc64313a121c27ee

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