Malicious PDF — malware analysis report

Static analysis result for SHA-256 25781cbb25b54885…

MALICIOUS

PDF

75.2 KB Created: 2021-07-13 23:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b346fecdd47377efa8ecde38d712c0a5 SHA-1: 187de6beff8b72133543a64e0fea0960cb7a54bb SHA-256: 25781cbb25b5488567486e52756042b8a54a2bd5269a325b2751a9866a3be341
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics point to the document being a link farm hosted on compromised WordPress sites, with numerous distinct hosts and embedded URLs. While no scripts were explicitly extracted, the presence of PDF_URI and EMBEDDED_URL heuristics suggests potential for malicious redirection, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/0f9b4ca639e428bee91075f44ab31928/22462948898.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ae989829531---wowepinegafex.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a044e486c17---19944035012.pdf
    • http://fashioneducation.ru/userfiles/file/21374811175.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/e461c7e79458cba70466623818970dc2/tuwajemama.pdf
    • http://ck-kutnahora.cz/gais/image/file/nopovafapawa.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be5650b2608---3567476817.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/fd6786e7202d0c2840d7bd6d39f040d8/mulabidadi.pdf
    • http://mextro.de/upload/files/mipusogitogizefe.pdf
    • https://happycolaborativo.com/uploads/files/zapoxawobepaxekote.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c245c4bdd---48833601801.pdf
    • https://bawwabatrizq.com/userfiles/file/jakuvet.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/hfb3d6gdjrmdmg8e7oclnavq9q/vovatipabadukamiwe.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607833553fb98---9746815922.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abdc1c3080d---18727678242.pdf
    • http://newbusan.net/FileData/ckfinder/files/20210627_056DDDD70EE1E4AD.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb6b502738---64930775310.pdf
    • http://berrybucs1973.com/clients/3/3a/3a2d6910be1067feaf6dc79f90d505e0/File/81475264712.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/385eedb0be2f4349f45e4104404777eb/sepugufelepezogofarefese.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed3615797d---nanuvi.pdf
    • http://ok-poland.com/userfiles/file/68558788209.pdf
    • http://ngocvietbungalow.com/upload/files/lujawi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=listen+to+our+hearts+casting+crowns+lyrics
    • 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_off0000c43a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC43A 16792 bytes
font_01_sfnt_off0000dc4c.bin
d708fc9e149d781bf680470a4b8dc8d5fbae961b4c2e44020d1ae550f58c0e06
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4C 16640 bytes
font_02_sfnt_off000106c2.bin
5740b354d8bc041dd77248be6fa2bb165c542daf52fb51b7e01501e04578e595
pdf-font-stream PDF embedded font (sfnt) at offset 0x106C2 10768 bytes