Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c09ca615ff2383…

MALICIOUS

PDF

83.8 KB Created: 2021-07-02 16:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5080ce771b2836e89992556808df8e9 SHA-1: 11e8ed66d6732bd647a8ea988829975511830c7f SHA-256: b3c09ca615ff23830c15cea7b6aeeb27c35a824f5ffbea3562729014778228f4
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links are likely intended to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070b63842669---21729110462.pdf
    • http://vetcarefoundation.org/userfiles/file/fimowulijitiwogutitesisa.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/eb1b53c80073920bdf425e7a55240dfa/muvoves.pdf
    • http://aostavet.it/userfiles/files/2102607581.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/dr63o943h2doavbi4iv2mqrup0/jazowiwaperugu.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2e39b01e7---nugud.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b11a718bd4---21434239965.pdf
    • http://alliusie.com/userfiles/file/nilileboburafi.pdf
    • https://tonwen.org/userfiles/file/nokemosomefesoreb.pdf
    • http://andrewsexes.org/clients/867461/File/lubewi.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/dc6db61672fb9cb5a70a0dc0187f2702/liravowonozodubegumolofe.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e72c357471397084dc7ba5aa3a6ae3f0/tekewinituzijumurivesiwix.pdf
    • http://tuzvedo.hu/elemek/file/nusuginukejupolamagoj.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed033ac540---xolotipasepabofipemaped.pdf
    • http://myxroad.com/upload/userfiles/file///kavitawev.pdf
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/98317649657.pdf
    • http://renovator.cz/files/file/mejivexowifudilekokavoso.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d854cef29---32148693222.pdf
    • https://rivaflo-south.in/userfiles/files/tafanojexuwemit.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/guhl1oejo7rpa9596ke0n3v84f/95646780047.pdf
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gabotakijobu.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/s9n3rhb2u0rue53k5jem5k4rej/50457462769.pdf
    • http://gfb.it/upload/fck/file/25576979016.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=middle+deltoid+workout
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e936.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE936 16792 bytes
font_01_sfnt_off00010148.bin
9d0a76d8b533d6488fcbf8806be3f8092fb3d96e3b2b49a6a4ce4bf44a7d7a2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10148 16260 bytes
font_02_sfnt_off00012b5a.bin
d515c426482d0cfc9d75e5404e744c57ec052b758a8dc9b34688330e41e4cf26
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5A 10076 bytes