Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb5545e6f16f54b5…

MALICIOUS

PDF

96.1 KB Created: 2021-06-26 04:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0df98f6bb3298f1b49d603495e4330d6 SHA-1: 1774ac5a2f35f3f17bd49e513edae00b96c3a3a6 SHA-256: eb5545e6f16f54b5bb0385587d084bd3b61588332236e81692c9b8656fae46b5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting it functions as a link farm. These links are likely intended to redirect users to phishing sites or download further malware, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://chcial.ru/uplcv?utm_term=the+reaction+a+to+b+follows+first+order+kinetics PDF link annotation
    • http://www.yoko-ono.be/images/userfiles/file/64297031882.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/102d3f19454186a208ad04d8f77a3cb8/57229237290.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ade393c4596---pogopuva.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/mofivu.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/roxupiwazomap.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/8384781891.pdfIn PDF document text
    • http://guchenes.com/d/files/lekutedijezujofejibido.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f80d315bc---89870970459.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2349c10d9---nefufo.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/000eaece66eee9e548d49f77211c09a4/zikeroweke.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/94789944338.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/bivavoja.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/3k8fdsiaort42qn7c6r1cu2et7/duxisetuvisitolaravosusif.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/domarixajiniwadibox.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/minererulimigixazafujek.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/bcct854ucoc0i1d09asalnduil/dijepigodaj.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/fpotpjaer8vtgrjiimqluerhuo/92589184818.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160994231ced76---xalagumunofoto.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9b78f0ed3---66355334179.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a1395fe8ef2---pigiwepumetabiki.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e57552249---15083551522.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855148704da---jabepinolefibamugezudiked.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/42f0a3419c6e809448acb27f17666ddc/13698673014.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/rexadabolabamulenomed.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/hvn1niut87akonakkvs8u32jj7/31277630069.pdfIn PDF document text
    • https://biocoils.com/img/file/57975838469.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/saxurusipujoperazopuzim.pdfIn PDF document text
    • 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_off000113c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C0 10852 bytes
SHA-256: 057139445821b8c29a9608ec4edad2b06a4658edf4d4118ac5a6b9011cd24fea
font_01_sfnt_off00012cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144ED 17544 bytes
SHA-256: 35327a6bb6158196b3f6f090abcb30673964352794b1efaf038218f9ade64381

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