Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a035b27ca5b371…

MALICIOUS

PDF

86.0 KB Created: 2021-06-25 21:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e68db27dd13a9bacd90ae14656b1bdd SHA-1: 80e80509ed87cfae5b25ab4ac743241ee7b1d52a SHA-256: 35a035b27ca5b371e630154ed9c02d7e525f7fc55c32cd27979de5f5728cc4a2
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://louvre.lv/res/wysiwyg/file/fenizudetekodoz.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/8aedbf9acfac584a073bf11eb7ce352e/89929684074.pdf
    • https://calmoinc.com/upload/editor/file/tixedarutaxedukawusulunej.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/u7gthc4rjehakmqpvc59bhsv70/xewukugufudize.pdf
    • https://heks-tech.com/app/webroot/userfiles/files/14732031567.pdf
    • http://vistobrasil.net/uploads/file/98577337284.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085bcfeae11f---fikudovofojefiwadowo.pdf
    • https://anthonygillant.com/userfiles/file/zigavumaxijatases.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2f6497e6e---felezoxosobitevirom.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/71d2216616a973a171485e14d77719d9/livujuzonilafopog.pdf
    • http://www.prieteniitehnicii.ro/documente/file/13614228810.pdf
    • https://advik.net/userfiles/file/25859632808.pdf
    • http://goldenpoolandsauna.com/user_img/files/tinunelefiwetozamuf.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/ddaed33bd9c254c5402cc4b904876d15/94985765112.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/3becqqvdffsg0k62p2474v4lu3/20064299993.pdf
    • http://kelvista.lt/images/files/59412117977.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0964a5f14a---pivuzujaxapu.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d57df3e33c---55028914862.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/85449495162.pdf
    • https://elektrona.cz/files/file/93860077866.pdf
    • https://panificiopasticceriabattaglia.it/file/mevun.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/setaruvomejixen.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=buphthalmos+congenital+glaucoma
    • 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_off0000ee29.bin
b57bec4afd3d8e2a7693155a715add9f97d165e200fd0b31a347015d88a6c878
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE29 10872 bytes
font_01_sfnt_off0001072c.bin
9cf75e4c9363db73df1559e9a07b6a4570e592e53f9984686edf631c3cdda0f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1072C 16680 bytes
font_02_sfnt_off000132ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132EA 16792 bytes