Malicious PDF — malware analysis report

Static analysis result for SHA-256 693028229ad09acc…

MALICIOUS

PDF

74.6 KB Created: 2021-10-02 22:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0108d2a3dfe14b3da8055a82a3b56b51 SHA-1: d19a0f539a3c40971332e93733acb5a74f63ed8c SHA-256: 693028229ad09acc932210e9eebab222f440a523a2a8eb601e0831539019b735
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, potentially for credential harvesting or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://smidgel.ru/uplcv?utm_term=best+baked+mostaccioli PDF link annotation
    • https://ferado.vn/userfiles/file/4115589107.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/26012201328.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc1fa3473f---zopevifamamub.pdfIn PDF document text
    • https://fasaac.org/temp/files/90536828162.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/59307041137.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16151e236569a6---41074861360.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/rimixerokimebedagu.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/35080912542.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/29371175823.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/tezezupe.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16155cb3e1c3af---bafowudure.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/fufusagu.pdfIn PDF document text
    • https://teamcode.net/upload/files/90335502237.pdfIn PDF document text
    • http://autodilygood.cz/files/file/zemigawox.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/jumetelepodiwodozerawixez.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/87358023713.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/47377451182.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/4317488307.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/55653471372.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/susidulevulixi.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161454ba3d9e9b---sabebajenad.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/vorutir.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/prov43cn57ng953tap86oqh6q6/koruvobaxakokuvukegowug.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109030820066884.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/wibiloboxagigi.pdfIn PDF document text
    • http://sswjeans.com/files/11105390179.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/3e7bb6dda33a8d943d84f9f11966d23c/wufijejisanuwezuvu.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_off0000bdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCB 10612 bytes
SHA-256: 4c34083617340dd4aed2f6472e31f0592937bfcd69c7e3558baf51cbe28bbd9c
font_01_sfnt_off0000d621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD621 18120 bytes
SHA-256: 91c2a6f097332503d9fcd38fed191b8a44a8469b9b6cb2350960ef061e25dcc5
font_02_sfnt_off000104ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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