Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e595bed9cc6537…

MALICIOUS

PDF

93.8 KB Created: 2021-09-12 20:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 91960a7f74025591890799a7260af442 SHA-1: ff208bf49e294638ecda5bacd4618b7207cdcc7e SHA-256: 24e595bed9cc65377bde415b688d44b4e18131321ba6ad45254447bf1eeb68b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to various domains, many of which appear to be compromised WordPress upload storage or disposable hosting. One prominent URL, 'https://cructi.ru/uplcv?utm_term=db+fighterz+download+for+android', suggests a lure for downloading an Android application. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://cructi.ru/uplcv?utm_term=db+fighterz+download+for+android PDF link annotation
    • http://traktorpulling.de/ablage/userfiles/files/47354204517.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131f413bc519---lejutoz.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/jenewujas.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/likabimawuvefibuge.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/4610151137.pdfIn PDF document text
    • http://inica.org/files/file///rironuvaxoxuxirosel.pdfIn PDF document text
    • https://karate2.cdmedia.pl/userfiles/file/vopanesute.pdfIn PDF document text
    • http://mrybalko.ru/files/lusipikeg.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134739917b78---zerojakajum.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/visexaresabegebivin.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210911121106.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/xewebozosilu.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/cjptjlf9eblgikkb5v2uss3ig5/7919089856.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161327e2ae6b1e---59575356806.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/45178266828.pdfIn PDF document text
    • http://vo23.ru/upload/file/mobipolaw.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/fevirasezesoserenozobeno.pdfIn PDF document text
    • https://baongochoa.com/upload/file/newupis.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/dabelawevadur.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/gutawasatepefefoxod.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/galufoximaw.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/64459093693.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109100935156219.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/16981411244.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/99753386583.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_off0001069a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069A 10752 bytes
SHA-256: 68fc7e049624b11bcd2f7df57c36f0d95d768999059f93fecbb294e60305d1fe
font_01_sfnt_off00011f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1C 19004 bytes
SHA-256: e3d9edba9608c6094f620a63177b3dae0c79cd30f39042837ebf362f38e0f8bc
font_02_sfnt_off0001502c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1502C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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