Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc204f406b631d4f…

MALICIOUS

PDF

80.1 KB Created: 2021-06-28 07:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f877aad4efd0692d5c63bb72615c8b5 SHA-1: f49586112b37a7c6976a6c4edc7d6f3cd845e12c SHA-256: dc204f406b631d4f36f764498a75774ac225a5e932ce038cb27c9d9e52495293
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress installations acting as link farms. These links likely serve to redirect users to phishing sites or download further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/d83377786fb3d41f65eaaf399fd012a8/32771989503.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b5294e565---mutaxamafomukefutexijana.pdf
    • http://rymwid-training.com/userfiles/file/66772928071.pdf
    • http://matstravel.ru/userfiles/file/lipoxowozeb.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075a15612de0---24561752355.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad62d348e61---1143115058.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/drr4lacgf8qsjce9djsidj2fm4/69155992335.pdf
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/36238182054.pdf
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/kaboraruvadolugibit.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160845a1bb119c---gamufoz.pdf
    • http://amirafouad.com/uploaded_files/file/60837719943.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/28d90ba4b8c1033dd082e3ef9f6a5138/duxobotot.pdf
    • https://www.avantagesapp.com/uploads/files/2113625868.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb152e5767---90198706100.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddeffab34a---85639804788.pdf
    • https://amd-export.com/site/upload/file/wotatolitedururexokunu.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a63f478b3---49866187318.pdf
    • http://dzwigipoznan.pl/userfiles/file/40972198646.pdf
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160796062a7906---45147344358.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/tk3f4k3r1tcekm5livj7cujtb8/90218765027.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8659be90cf---pubarewuname.pdf
    • http://hodinovysoused.cz/upload/file/lereseforigowibabiman.pdf
    • http://alexhoffordphotography.com/temp/files/file/bisobotazigamezaloketanar.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/b1a35bc1a5abbac5041b08e41994a76c/zomatemufepomonenabezuw.pdf
    • https://iwistw.com/upload/files/52347182384.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=stay+at+your+disposal
    • 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_off0000cd53.bin
45986c895e78519d4122879adf9e4c93345245127f106f4faf0249b489d4baf3
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD53 24076 bytes
font_01_sfnt_off00010389.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 16792 bytes
font_02_sfnt_off00011ba0.bin
b182d1338e435217ed8f48bf8594d49b2eb717835886a7c6c3252e0643c9f81b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA0 10440 bytes