Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c08d496dbed4241…

MALICIOUS

PDF

93.4 KB Created: 2021-08-27 03:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 692584d8fbcdb4ac7e5948a8831cf2e9 SHA-1: 847db37cea8967ab74dd0bc38e4a3d235573a137 SHA-256: 9c08d496dbed424192e2847d70592df6206668a29c57c56a666b01c3a6422b8b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The document body is heavily obfuscated, but heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document is designed to trick users into calling a phone number, consistent with callback phishing or tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://wastran.ru/uplcv?utm_term=kendall+county+courthouse PDF link annotation
    • https://mmszke.hu/files/file/kalenebimulo.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607364810e3c5---gevenifepunitiluxi.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/6057962112.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/8330cdde72e54a661acacd18c5732311/91409443522.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/5oiv0l07cbu2t1leo8mqnk5173/wiwivuxekidutekumabob.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/700a9f156008f047d56ffa0072311c73/50954317443.pdfIn PDF document text
    • https://strechybenesov.cz/content/rafosefoj.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/kojopawiwewizusemavezu.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/3ic0plnmvedqtqch9054q8cml5/nowoxajajobuzakupenaz.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/47374798107.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/40630613155.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/rozetoladalalabowuxu.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/kumexepij.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/94981101263.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/kozufemuwixarow.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/cb9856ed5278851b69e07fa265c35f4a/21578019682.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcaaea5b10---9350287276.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160707f447eb84---38547604660.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/63293658908.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/serelo.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/77538574365.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_off00010ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA9 10580 bytes
SHA-256: 241139843e9a78cb3256bc4cf13149d9ef988170a4d6a2357dc81c7fbd6ee45a
font_01_sfnt_off000124d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE6 16832 bytes
SHA-256: 082213c1e98a25419a07286faa519f2304942fd754b820beb39e261ad0b31738

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