Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a9f87bede88206…

MALICIOUS

PDF

82.8 KB Created: 2021-08-27 09:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d2ec915aab08dbe668865c804ac96a8a SHA-1: 6dbac831fbe4e148021531569cd3ac8f440b84e0 SHA-256: a7a9f87bede8820642ea7394f83de88d8df4f7072a45d950cfea4e5734480cdb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://duocthientam.com/uploads/ckfinder/files/9357024892.pdf In PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161255452f374a---92585722120.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/jibipositabat.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc61bbcdb4e---liretegegavitedu.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/5ad0ba315c6790c04567ba2d1c99f7db/9975726580.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d0d1f1ee8---laramibafexameke.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/xuzudojojonira.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/sinisixokorupalu.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/73370402072.pdfIn PDF document text
    • http://fedime.org/imagenes/96964914858.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/jajogidabubol.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c022906c1b---85211055937.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f485024679---13839166834.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/edd2b9889fee387c30917a7263805213/93240616559.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/10618236628.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab561f034d0---mazakefujenozupogoxen.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/9194f1d3628eeed62988e0955e2105c5/6952545666.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/up8co9iba4nlsg8e2aduohueu3/jiminawerelafuvegijovaw.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/37816109137.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607695043752f---fefan.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/zumabifexovamap.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611c2ec5db696---zusoweniloxoxelakulene.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/64795b4e1ea87c8d7a8095d6d54e69c9/xekobomapinorerafiwig.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/zusowopudevitejabiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=after+we+collided+online+bookPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 10440 bytes
SHA-256: fc259d78574938d20146c7ff82876544dab603c6272052e1665905eddd60d5e8
font_01_sfnt_off0000fafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFB 16692 bytes
SHA-256: 7de7c4b8e894c9e2fcad25eb9c01afda418062ca3905d16353d9e87082117903
font_02_sfnt_off000125a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1