Malicious PDF — malware analysis report

Static analysis result for SHA-256 de2636ca96675ede…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 03:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 522e2851720485f56b1ba5c237fe1eda SHA-1: e26b4f07abeeef709dac8786d7cf6e359f41c401 SHA-256: de2636ca96675ede7407b22c4d4ffc839121daf42ed57f188a3e6ed2a77b9c7d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pixomot.ru/uplcv?utm_term=convert+pdf+to+rtf+file PDF link annotation
    • https://signatureshreyas.in/userfiles/file/74234608751.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/921n2s36obqiihfq00jn22bgk1/kesavawomavezaletiza.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/90831620475.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9b2148d25---19759340612.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a753e3838f---sozirupen.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/fotinagukisusiwo.pdfIn PDF document text
    • http://eva.am/files/6120686002e8dc63.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/74300331476.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/66598104097.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/38609848961.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/34142071132.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021090323121770554.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/zanuzi.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/bevaxefivosodanozexojaxo.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/wozamu.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/19587392768.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/59012510291.pdfIn PDF document text
    • http://8njl.com/userfiles/files/vadopiwake.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/18112196634.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/supifolutixunifunudewof.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/30504769878.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/megesajo.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/jodasiga.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/63487974529.pdfIn PDF document text
    • http://peak-experience-japan.fr/images/blog/file/23755918206.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_off0000ded5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED5 17624 bytes
SHA-256: 690f6fc92a13aa536a7f831de9e66a94c7376b1fc3ccd270bca371cd830c0fa5
font_01_sfnt_off00010ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 10260 bytes
SHA-256: 1379443bb0e1679b60eb3df085990ce1e7ad4efbd5204d273e0674687afe96fe
font_02_sfnt_off00012413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12413 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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