Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b63af8f0767de9…

MALICIOUS

PDF

78.4 KB Created: 2021-09-02 18:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ae4cb21a4b2cb9472e14447e67ad11aa SHA-1: 3176f8d7d510d29e20e149fc652374bd001da17a SHA-256: a3b63af8f0767de905520444c34c5953d0fa84a88d58e3493c7ea5b003a39c9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bajajsports.com/userfiles/file/nopumimalowisojozowatub.pdf In PDF document text
    • http://alnoorcity.com/userfiles/file/didakurapukigikubojuwufa.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/94052bb216dd1be23aa920b2bf61d964/58367592257.pdfIn PDF document text
    • http://cnp-inc.com/ckupload/files/jisibot.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210605133508.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/31552769856.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89392343101.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/xeralawoja.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48f89434ee---96764819538.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/57533722842.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/18145638438.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/49223974877.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/23720445081.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/mevojuxetofixipixotusa.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/gosimufejejimomajifix.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1611679725cf9b---tufuzivoti.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/19137785101.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859683983ec---43680840961.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/suwefikijem.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/moletajotasuloved.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ivan+brunetti+cartooning+pdfPDF 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_off0000cceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEB 10840 bytes
SHA-256: 095cbd59a4252d4e88b88fb58ac1653ee477f41f1c4ff853641627ad62f8eef4
font_01_sfnt_off0000e5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AC 17960 bytes
SHA-256: abee0ee5d4ba24d84ea69bfad92bcf7c1d939c960c48675dda299c33bef84ce6
font_02_sfnt_off00011467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1