Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae7b0230371c1bb…

MALICIOUS

PDF

107.7 KB Created: 2021-06-28 16:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc292b8a3d2bb9040133b44555987775 SHA-1: 3debecf00eaa055ff27f4862070e2a7f4fd55d23 SHA-256: dae7b0230371c1bbaa58f908c8c232c74b34d9d10a98f03b275b3caf43bce62a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://huntic.ru/uplcv?utm_term=vera+castles+in+the+air
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16086825d81a9d---xuzijutumodizokajo.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/e2ce69c2a1360688dca5bc5b598e24da/17493598801.pdf
    • http://fluidearthconcrete.com/userfiles/file/nosabukirapefavejepati.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/68c1a2d247dfe9611d8b972d6d804208/2861183652.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160892c9e0a7c8---vekaxizizij.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac071b5078c---jumasedimonejizilemujuva.pdf
    • https://gymlesgeants.com/upload/editor/file/mogagitunasopedipudal.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b574ec14744---gozarigipobovute.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e5cd67507---rizivalujitomixapav.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4a847674e---voxilaxukafaba.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a467e169df9---31588766356.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607444d57b11c---4645307521.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072665dc74e4---suburumijojujazuneri.pdf
    • https://noticky.net/akce/fotky/file/52499697694.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab97eb3743---vidugulotijeginurofo.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/h78h1tjh3munujb9fkou4koof5/29739303638.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7ad4bbb6c---52954778545.pdf
    • https://noddy.nu/images/file/nevutagonazuk.pdf
    • https://tavio.ru/files/file/jogetumuwanava.pdf
    • https://franchiseharbor.com/files/files/vopebov.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/99132387291.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/48098f956279badb12d43dfddc59f7b0/18703515272.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160743cf54dcb4---95524114927.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9061b3032---getaxuxipit.pdf
    • http://diversecityuk.com/userfiles/file/90379973655.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/19180801233.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_off00014495.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14495 16792 bytes
font_01_sfnt_off00015cac.bin
6eefcfc85cfdd12dbb85f665e6d19dbb9df447a32c74543c67f771ade9b823b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15CAC 10176 bytes
font_02_sfnt_off00017351.bin
eb409cdffd3fd6b16c431739286d9d2140a4715417f515bd7326ddec82cc8c8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17351 17804 bytes

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