Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eb186b33294b43a…

MALICIOUS

PDF

73.6 KB Created: 2021-09-02 03:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1ec5d2ae1dd436a4ead25cd69d627943 SHA-1: 9976b0b263c50656f7be54aea9d335df9cb5ba40 SHA-256: 2eb186b33294b43ac414707ea4c8d10d416449ff973e68bf1566d31997020720
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to other PDF files hosted on various domains. Several heuristics indicate this is a link farm, with some links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098323b2d2f4---loxiko.pdf In PDF document text
    • https://wsbtitan.com/images/file/vaduxivavewamipujuvetezuf.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/73058138990.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/berixud.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/senanidefekexaruxalan.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/finonojekax.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af3817b0cee---11657223724.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/bffihv0489mkbm1rck0uoc3q55/31600346443.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/nefamosowemenavo.pdfIn PDF document text
    • http://sbkf.org/files/files/gimewozudugetubofaki.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608380c5d22b7---67163358020.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/pesumibemoferab.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7e651c598---xapopafoli.pdfIn PDF document text
    • http://geose.ru/userfiles/file/57078833537.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/39363149827.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/migisokowaritama.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d32b277f416---jagowu.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/5b1332935dc8b9ceb1bdc9dbfab47380/40237728059.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/pidubajipotuvavabutavub.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/83972611031.pdfIn PDF document text
    • https://stvorki.ru/files/file/manawonivitize.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16124f0be5c0b7---84643804220.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f053e96388---27628748895.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/botivevosorokujij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=men%27s+health+belly+off+workout+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_off0000c0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C1 11060 bytes
SHA-256: f71d8036da37a026c21c685188c19ad8d3ce554695e0ffce75b754c28b1f58ae
font_01_sfnt_off0000da6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6A 15072 bytes
SHA-256: 9397655738501013bda3eace5b541317a6b6b496551436abbc54148adcaab195
font_02_sfnt_off00010068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10068 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1