Malicious PDF — malware analysis report

Static analysis result for SHA-256 016d0bc7b798a457…

MALICIOUS

PDF

74.4 KB Created: 2021-06-30 02:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 079230455548f14d7bd30a884454c2d4 SHA-1: 6225afab7aeec8ce5706a905e7069b6c9cd1e9d3 SHA-256: 016d0bc7b798a457c7183b49cdeb70683b282927284e9d26f07060351f35843e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://coretry.ru/uplcv?utm_term=cortisol+in+blood+test
    • http://easyreturn.store/userfiles/file/35671685353.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ff8kaiik3dv2okjiks9o48g1e7/96658697410.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b97b9f0b51b---munegixig.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160788ff67426e---20818360386.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/bbf4e3212f71865d6d5163d2c946ecd9/76427464049.pdf
    • http://doktor-okonski.pl/uploadimg/file/zuwigelixadexajikenokas.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/39k2bcgtq3gbnkf404pmdv51mb/25300962003.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c862599f73e---luponuzoki.pdf
    • http://rhondachem.com/d/files/75734745693.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843750679bc---puforirix.pdf
    • http://rld-carbon.ru/file/15817124786.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bddeeeb6ef1---fowinuraguzixukawujakuze.pdf
    • http://humanitool.ru/userfiles/file/54652144264.pdf
    • https://morabia.fi/images/file/nuxagegoxininoridevila.pdf
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/8e7475a778bc5f81eab89ad315a09764/fatadixifabasujovapi.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da534aa3864---47696930114.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/9imqkaaen32dqaeao4mfv51p9d/gasitemulaneloxonavojimev.pdf
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/5f43348ad7b49a60204fa5f02c564dab/toraweworamilesuvenaxe.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/687d43993a39ee96c46fc4dcc92022e2/ralamutidoku.pdf
    • https://communeouchamps.fr/userfiles/file/50254590253.pdf
    • https://cambodiadriverservice.com/userfiles/file/36599254825.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/a3a59d695ae54b8eab8ce39c3739b8c9/mixibimo.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e3945aba---sifotujubutozer.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087efab193e4---46600605171.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_off0000c2e9.bin
0d9d72a8df9cb7bbf4f866e391f7467b331b19d35e136042f17335eb57a2995c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E9 16356 bytes
font_01_sfnt_off0000ed59.bin
4a7f9c5d7bc5039e2734911e4ac1457afc5ff28d103591e86917876ef9780408		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED59 10248 bytes
font_02_sfnt_off0001047d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1047D 16792 bytes

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