Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5e74a116982aaf…

MALICIOUS

PDF

81.3 KB Created: 2021-06-26 11:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f87552f3592fbdb374d17bd11e4c25d2 SHA-1: 01359c1024f164239e56b62ab0424a110ee12b75 SHA-256: 8c5e74a116982aaf3f55b733700820a00b22456e9e0e8f084ea69974b22ed7b9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further indicates a malicious intent to host or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://catamma.ru/uplcv?utm_term=austin+and+ally+tunes+and+trials+full+episode
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/u235ri5dnehr0ffu0i5v81qoaa/52430535750.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db62e80dc2---naxajodu.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084645245724---vevuzip.pdf
    • https://botorka.ro/userfiles/file/44680902727.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/0vd4shttualpa9igp7kgtqfshj/takalebazu.pdf
    • http://barcabianca.eu/upload/file/kidesudademesesovuz.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b094e2aac---safomet.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/78ee34eed3916d0beae85aacff0271c1/dokozokalusonifix.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7d6419f4b99ae6dbb7ee17fff3e7cf80/79428842583.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0c3f71955---fisemawanuporuzutarikikil.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607f86de4847d---31288903460.pdf
    • https://thehero88vip.com/ckfinder/images_store/files/69851395810.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160adbab32bb6e---19775180981.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5723181ef9---78253288058.pdf
    • http://c2r-auto.com/uploadfiles/file/2021052210044173499.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/ee4aeb61b02374a63f86daeed2987fdb/refolexomupuvut.pdf
    • https://jetaime-shop.com/files/36388799249.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/turenodejosaxese.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba2da0150e---40788504378.pdf
    • http://thsport.dk/ckfinder/userfiles/files/70340319606.pdf
    • http://sinproval.it/userfiles/files/56429334723.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/n995cn13j783bsnn5n4e4ctge5/24350212423.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fda2f09ca9---85815664455.pdf
    • 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_off0000db4f.bin
84797b9ff8ae874c253325dc80b091ffca363b3be2a8a2386b2b64f80cf2fee5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4F 16724 bytes
font_01_sfnt_off00010722.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10722 16792 bytes
font_02_sfnt_off00011f39.bin
20f3a59b855ac53e20604951c2b7dd4b418d9f157759741ef43bdb897c9cfd34
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F39 10684 bytes