Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2c858fca70137c…

MALICIOUS

PDF

86.8 KB Created: 2021-07-28 12:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8e160fbc3eb2775500e5287fcf536c4d SHA-1: 1a8717ee673c3f5a8c994a36e6941f0c63d2400e SHA-256: 8c2c858fca70137cf7b8e5727b49386c1f621ca0f0ad83afbae52dbd4a56a3ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm used for phishing or malware distribution. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://onlineticketreview.com/images/file/pibazun.pdf In PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/64290475762.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070d23da5a64---dikijov.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/fexuvu.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/63566301632.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/52860304195.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/19315808401.pdfIn PDF document text
    • http://1976ahhs.com/clients/32223/File/ravapezupi.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831e9e0ba3a---1311235765.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/wejoliruwigusupavibiko.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/53771964403.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/mifenorojivafudaj.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/hqoqg4mdrn1dhitcfc7jkuep55/xinutuzijadekesamapixig.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1c12a07c8---42306564533.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/77410411651.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b86cd4b7f07---pudufoj.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/3921133076.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/cfaf4b51a516f378044d838b0f3539fa/1427086803.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/39120612700.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a7b882655---68317464983.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083cab81e4ee---zumetibakefodurugebalufa.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/90121179260e6d80e625b1.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/44475596087.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/157213331a97b9f36a12a6c1ce448bee/18611261580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+care+and+keeping+of+you+1+pdf+free+downloadPDF 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://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_off0000ef61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF61 16772 bytes
SHA-256: 0909474873a11a6c1d61cd3201ac160fbe60c42297a882a44e06dd75a77d599b
font_01_sfnt_off00011b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001333f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333F 11040 bytes
SHA-256: 24621d2aaaddcf849b6f85bc4a54f1057a2a593a6440086e7403d9d612615dc3

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