Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08c7e0d9194bce6…

MALICIOUS

PDF

67.3 KB Created: 2021-09-27 08:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 011056ae2ad494a0867dff2ef47ce942 SHA-1: 356eb624fafdd0fd6a4368fbc579bec8f99e60e1 SHA-256: b08c7e0d9194bce68cc90a2faf6a548bd074fc8e34b32d0a855eec0bb67f1309
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. The document body is heavily obfuscated and appears to be a malformed representation of the PDF's structure rather than readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=zombieland+2+torrent PDF link annotation
    • https://ozora.schaffsen.com/contents/file/12919223400.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/82673105029.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qsbdlifav017ik4cso4c5ivab0/27985421508.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161381e1d63465---55417236146.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/91d0712975dfc27169a8bd0a6fcd4d76/wovaf.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/67775a570e27268ae3c1caa88c377ec5/wuwifidove.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/28481314557.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/vobedujivub.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210904123036.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/90127207305.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/11721103261.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2fe1aed76---tadixebile.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/51692841499.pdfIn PDF document text
    • http://wingtsunkungfu.ro/imagini_ws/92672396344.pdfIn PDF document text
    • https://beautydent.hu/editor_up/45221551048.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1612eae00a879d---73968485106.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/batimogafiwimewumesesuxi.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/50861047774.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/nogijirezok.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/60376189185.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/68344707472.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/benasenunatak.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/20657141132.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_off0000ad36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD36 14292 bytes
SHA-256: e7d47a135e50bb6d63bd8b17e515fa757b1b644c03b2bc0de4a21ae6703bb041
font_01_sfnt_off0000d080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD080 10464 bytes
SHA-256: 94cd6d5a494d7b04c0205adab4531e3129b0ff1a028eab7348e0978cf9c6e8f0
font_02_sfnt_off0000e834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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