Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec7eb0765e45ec0…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 18:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a4e0c0e7664f4accaad01326ac6e225e SHA-1: 0c99e0fd43870bb6ceb1a0fae6a794e04c8e08ad SHA-256: dec7eb0765e45ec0eaaf6e5a65ac9220e7b23addc3237df5d1a10ee6c33594d6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or redirection mechanism. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing attempt, where the user is prompted to call a number, likely to extract sensitive information or trick them into further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://medvor.ru/uplcv?utm_term=clean+coal+technology+pdf PDF link annotation
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/91555301559.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/47760082272.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075489f0e211---zuvurarevumizomezi.pdfIn PDF document text
    • http://lejonhund.com/upload/54646589839.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136027fd9b44---50915783541.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/f2b79398de975b6fe8367ef1698245ac/12239817494.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/41577819413.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/pileralisu.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d98b712e746---2950974670.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092aa42b7cf3---23426715333.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb23ed2d42---tajibipofekak.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093deaae8e12---18820181045.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612e596dcd4a4---kirimum.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/tedavewivufetub.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/44982491769.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/35188784589.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161160a6d9eaa5---kobifuluxaxofuruwebupixu.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/wizutonadifirariwinirejin.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/c7a9b45a2cd9198802415711c7600a72.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea7f3bfa8f---vosugigufugori.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/11556dc6c0df6f04ccc488f980b794c8/pilujomebewemopobi.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6822da7c2---10086870425.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/77713563788.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/37068279040.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_off0000ddc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC6 10684 bytes
SHA-256: 62860b8bd96d923936b36de073cc6543edcc023cf39a0688f5b3d32b3100ecba
font_01_sfnt_off0000f60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60F 17392 bytes
SHA-256: fc104259bb27ab3eb56b6a0eb7df4d58e04595b3b7e41800a450c87fcd415cf7
font_02_sfnt_off00012344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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