Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ba167088cf874b…

MALICIOUS

PDF

82.0 KB Created: 2021-09-11 12:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2587bb638665a801c2560565e3d4cdb1 SHA-1: ed79eea8519580ab332655a8e5f5535e41141b69 SHA-256: 75ba167088cf874b9cf522905bc0cc53fe35fca5274393c25b3db414e405e39b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a link farm for phishing or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common technique to evade gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://netiko.ge/img/Data/file/suboxosavip.pdf In PDF document text
    • http://elma1.ru/!upload/files/54400577648.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/27342061099.pdfIn PDF document text
    • https://partnermind.cz/images/files/lifejawel.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/52276073669.pdfIn PDF document text
    • http://dmkert.hu/files/file/dememukevitexad.pdfIn PDF document text
    • http://state-lithium.com/upload/files/74731342262.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613310a07d7fb---kuxefekagofibolexagefil.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/bajepuwekanitotenofiv.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/52938163073.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210907094837.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/zexulopuze.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/garovezawevosejewerojojok.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf5482cc4e---gamevujuwaluvubiw.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/47569343871.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/23816532814.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328bf36b8d2---zefimajagalurezuj.pdfIn PDF document text
    • http://vladekoservis.ru/files/gaporakuw.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210908013441.pdfIn PDF document text
    • https://biocoils.com/img/file/57356286397.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/vupinoditi.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/49958708124.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/46611733401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=windows+7+ultimate+iso+file+download+filehippoPDF 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_off0000ddc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D9 10892 bytes
SHA-256: 01963d4de6c65e7140c700fe6cc14a7312a9359b45822c25f5eeea683f0e06df
font_02_sfnt_off00010ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF1 17204 bytes
SHA-256: 7b6d0bfa08a3d24ea10431de505888960fb3c955dfe574b812ea7ae680e1e84c