Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f688be8f812ad3b…

MALICIOUS

PDF

130.7 KB Created: 2021-07-06 15:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e3c6c3f6d11bc4fd3555fb828964a7aa SHA-1: d7e613b13a60148d0dab6b8db27eb23e549bd4a2 SHA-256: 3f688be8f812ad3ba51d8e8cdd6addaaf4b5959fb7721430895a6155f066c172
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple compromised WordPress sites, each hosting another PDF. This pattern is indicative of a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/q6unethpalkbn1k1mca6jgeja3/63658723160.pdf In PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607894e9c3664---62178870263.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcba7a73b5---xakewurepulafotonasumamol.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/044a39854015f9bad54994e41f11ddff/ribigufifowexabi.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/2cfdccfb7ee7a9a92cd629e12192c649/33524081511.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3804d6de8---vivoxajeroza.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/45038047504.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/3f9a8b74f2dc094bc84c083bd7780f45/jizejaza.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/a05487121dd20d60aab509888b3acafb/68431462688.pdfIn PDF document text
    • http://mldinsaat.com/image/files/45764089046.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16088ed722d5bd---vidozutebide.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/kemovenoludagiman.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/4fe0cf400fa4e27304ea0240c2f97a0c/1339256435.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/71c0bdba12e9414fd34d2dd092b202c7/dufopetezububed.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bafe6fe5475---xozeroxujakogimopa.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/68207236467.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/767sqngaclh1k3eq50mhsjj31q/82556085438.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/cc1fc1ea803cac32b742b2855c7e0b5b/degowukajer.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/f950ad29909667bb2761613f021cdc03/83634113705.pdfIn PDF document text
    • http://chayka-svg.ru/files/24268456084.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160786a43ac898---58153859827.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/db0b54b76f58cf99d3a076ffe7356e7c/67167447686.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/potopixomufajakejaxofofon.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bf5af3fb5---76967229571.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/56338244554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=bacteriological+analysis+of+water+pdfPDF link annotation
    • 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_off00019839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19839 11048 bytes
SHA-256: 3d2e0323f5b27d1b0d90fa544244e53c33d09fc8d281ba589d3f1661d0508e35
font_01_sfnt_off0001b1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ca07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA07 19720 bytes
SHA-256: fda2577ac06138ba5663eeaf243f922a5d81c0ab90ef4ec28bfc09d1e60ad542