Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ec62530ce99f33…

MALICIOUS

PDF

72.0 KB Created: 2021-09-26 09:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 82e79f6459a2d82ec507b5932ab13d02 SHA-1: 4859c3543189e703f14d4e11622e0673c8cd91c6 SHA-256: d9ec62530ce99f330d5e72c454892e20855bc2fbc4c27c7f78e47e93ccc0ab52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically phishing. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613d440b1d87f---84655566602.pdf In PDF document text
    • http://recviem.ru/img/upload/galupagaliro.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/pebaf.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/kavuvalokusanufere.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/57637673666.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/46992993671.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/vesaveximiwupodamuw.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/40882792308.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/lodalag.pdfIn PDF document text
    • http://mhzsolutionz.com/userfiles/file/41400037378.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/558484b5b6da777f9da0b2234cc8ea2e/regaku.pdfIn PDF document text
    • https://rubfila.in/files/file/27135421911.pdfIn PDF document text
    • http://k1a.ru/images/files/file/xuwivosexawulanesi.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/62101883974.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/jejajorumiwelixude.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/baloruloxopuvavofad.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/pabisokebomadazege.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a870be6be---33467649411.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/nijakinovolepusip.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/36969443281.pdfIn PDF document text
    • https://togeltop.com/contents/files/notekorulalupapuk.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/kuxuzepuwerijipopag.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/negabuvu.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/42281275554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=mac+find+android+sdk+pathPDF 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_off0000b3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C7 17492 bytes
SHA-256: d1d2e9c829a678a1bf3b4b37c0592e44ba63c2d1dbe3ce7b31b4a7cdda64a512
font_01_sfnt_off0000e04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF864 10624 bytes
SHA-256: 74e9c90249ccb436164116ded8ff263ac28f4f76fb7a1ba36ae87eb8bad6241d