Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4095ac40a634b2b…

MALICIOUS

PDF

78.0 KB Created: 2021-06-29 08:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e5305aec8db09e26990832544f9ccafd SHA-1: 833051b7fdfc21cd42fcd9a8e909be31dd0fe9d1 SHA-256: b4095ac40a634b2bfc048fa99123b48dc07fafdbe16b3381c8f3bfa3ee8596a1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised CMS upload storage locations and disposable hosting sites, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the link farm suggest an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=fame+meaning+in+bengali PDF link annotation
    • http://mya1fc.com/files/ckuploads/files/jifefururopeta.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083262490496---wuwub.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/a8eeaf2b524fc4ae129d1deb0bf34a85/morimimarejepuvun.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160926abd2ac1a---jowewovarisisokapisi.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b0350c63a---76484899208.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/4f92d409bb1c59f78240ff45b6e373e1/90765578717.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0ver1h7qjv7ecm2f59c02mk8q6/vojusibomomimozuw.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/td4fa4imf5jkadup2i8do3lcs4/73152780203.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/12175840884.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085824ae39a0---kegekupasemi.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2fdabab0a---zukufunubiwegekibifinu.pdfIn PDF document text
    • http://digifast.cz/userfiles/jifodevarepovodusog.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2050337b1---95990381433.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d22f8a2e492---vufirikeleruvipino.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cb2cc29dc---rigutapuxutadijog.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/m0n7etp5g0ot8v24u5mv52th00/75776227562.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/bfc35df9322c52957dd93462b81f0d23/57074911012.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/d4be5e6e9060eef7e1a89fb625cd9954/jusunamoxifivuxeliwo.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/nilokeru.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/81759843291.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/8ca7ec8960692e85442a79df06dfb4d1/vijimigaxupotugenanikajap.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/revow.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/51537204939.pdfIn PDF document text
    • https://emprenderem.cl/files/gifinomevixek.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/sisavoxodubalavo.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5518305e3---94305365944.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/p6nb5fb1tavoqrnv5rss2np2l9/dosipifawemejotiga.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_off0000cdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD7 17772 bytes
SHA-256: 9c64c17de4c38defb6c912deb0114e527cb9a358e345df8fe8bbb066c611a452
font_01_sfnt_off0000fcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C8 10080 bytes
SHA-256: 169c43923033f83d77c2a2e56be63a1e546e9a4a26ba1d9fb6dc6f6a39e5eba7

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