Malicious PDF — malware analysis report

Static analysis result for SHA-256 e536b67907d584e2…

MALICIOUS

PDF

87.8 KB Created: 2021-06-27 05:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 285a3c1ceab65907601ce8de7d8984eb SHA-1: 3bad83fe9ce5bcc8618a06ec0187174028d86281 SHA-256: e536b67907d584e27c39d38c2ec820c9a8cd4f2d3708fdb8f66237144b94d512
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites for credential harvesting or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://inwebjor.ru/uplcv?utm_term=honesty+is+important+because
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/62247d3e389fce9b2477e0e9a3513cfb/wogaxolugina.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098bbbf7baa7---54228214970.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086c6ffe143f---jusaw.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccb6d85b4f---78529268701.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/510b5df4997fda125689b0df1810290e/86714189332.pdf
    • https://investmentskillsgroup.com/images/userfiles/file/wemiguzovufomu.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f606a41e32---41795363944.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16096d668e19bf---16296678278.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/30anlnccmsd1ude86kc1121s11/52113298869.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/b7c1a64952cde9c130d5aa943852df85/fekor.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731d28c773e---42859372158.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/cfdcd383ecd0ca6dd9c17d9a3cf9bf1f/xesiretuxur.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/56816720041.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/tj0cjb551r7abkk00mf7ckv3no/kujabemekukeli.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/7fef7847ce2c8ecdaf14bc6ab2a1b653/nubevogesesexifaxopovod.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f303c563d0---95237134460.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2892c8e911---15144823523.pdf
    • http://ongnuocdenhat.com/upload/files/kekazixigewub.pdf
    • http://3sdent.com/upload/files/pivinusirosut.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a69fc9cd8c2---17366447096.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/7da0b1c63f40b1bae895115e0a9434fd/41457048055.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/bul7egn6daffarcj5ghecnvlen/89603091226.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5c2c06ede---99803427427.pdf
    • http://aqbnb.com/uploadfile/file/sexusederomuti.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbd4a12e0c---wurufugunofuvebapamaf.pdf
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/93887135920.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087195060c97---pefofatumijaboxi.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_off0000f5d2.bin
f89f74d27217e7140e76a6e18beb7ad1aaaee9cf4d5f3e44d68546f602ebcda5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D2 16624 bytes
font_01_sfnt_off000120d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120D2 16792 bytes
font_02_sfnt_off000138e9.bin
35f7a21b1ad4ad837899df7f1c239ab2f60a6ad976a77f8719dec79e02272e33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138E9 10832 bytes

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