Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae06a640ed1e40d8…

MALICIOUS

PDF

75.2 KB Created: 2021-09-17 16:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b8b54c6bf3ad5a2086ee90b0f76323f9 SHA-1: 3e0a05e06fe992b4961ae5c3d5a35f586dd93ab7 SHA-256: ae06a640ed1e40d8f829a9b5db301db59f313cbac86a7e082904199e8ac72ad5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://coretry.ru/uplcv?utm_term=dead+trigger+hack+apk+download PDF link annotation
    • https://locoffice.ru/userfiles/file/pajuwezosete.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/natetenetedexovugi.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/vadetemoruguduwijomejup.pdfIn PDF document text
    • http://epicridesnepal.com/files/bexivutofasekodugikuzoxex.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/3694921146.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/26746885764.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/84688909278.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/goposisum.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/87a57a86656bcb86f1c6960b3e85b4b7/fimofez.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/9774155597.pdfIn PDF document text
    • http://surausa.com/uploads/files/71879467070.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/megukapagomazori.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/kitow.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/xalagapinime.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ef2f78bb1---poroloxejenajaxemoke.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/fuwadotewok.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/refuk.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/35421008734.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/kevitobeta.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/30a30a2c360bfb0f1cd99b00e022cf84/71688027231.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/verelaxonepuxawide.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/gusikeriweso.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_off0000c3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C3 16648 bytes
SHA-256: 5057933a1c5238a7604fc7504e2df25966f196a7cebe4e4d150e886850f00a62
font_01_sfnt_off0000eeb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB5 10804 bytes
SHA-256: 64ea653d0a1d58856acde8bf3c983e2ee547f1d6cbd94f85dd024c70f975bc70
font_02_sfnt_off00010763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1