Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc813ab41c8b94b3…

MALICIOUS

PDF

88.3 KB Created: 2021-09-02 23:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3fea8324f98aee8a76b57ecd14010d20 SHA-1: 404be3277e9e42d3879e4c54bda9faac83341f66 SHA-256: bc813ab41c8b94b35408ec4d97c59a09930a049aeb90b67fb51fdeb7faa40eeb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing or trojan. It contains a large number of external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://infrive.ru/uplcv?utm_term=vaccine+cdc+schedule+pdf PDF link annotation
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/8acb2214a816167123322b4404b43dbc/sarudelobob.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/dumekokebutisepefesiji.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/dotaxovuwapepa.pdfIn PDF document text
    • http://weymouthhighschool1960.com/clients/9/96/9679770cb43d952edac6f872f7aef95c/File/87749106708.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/nomonivalonewagazenevunow.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/sadakiwisuziwuturujiw.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/95628149868.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160d6037873a1e---joriwunodobefawulobijeme.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb14156824---linav.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/bivewidavipejigubesobed.pdfIn PDF document text
    • https://tipresentoio.it/images/file/xonalutila.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/nipeperawekomerenidekev.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/75a42c7eb5b13f004f6fb3d656ac2f14/10712808958.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/ua2auetg68fha9icqkvntsdh9n/linerikifarunerufaxiget.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/50643540447.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115bd188fa77---pilomedob.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16088851af2a03---zapafasuwazibuginigowixap.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/tebanivilemo.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f233ab6508---17620245549.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b73663d13b0---81725791938.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/16721916993.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/kavum.pdfIn PDF document text
    • https://dhesient.com/media/sosixilulutokigurokimaj.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_off0000f47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8F 18268 bytes
SHA-256: 533f60b68aaf334d34dc737939fc8c8d4b554ec2e1b92a68db878d35f246aeed
font_02_sfnt_off00013c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C51 10468 bytes
SHA-256: 226cba2a7319694fa98b8cad59e6ef106fa0c281ca7710d3ec69b61773704638

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