Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff958be690f5d2f5…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 21:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 17e06b208c62596ab208a5c480aa869f SHA-1: 91f14d4c1d88a7796b6fb0bc3b20a5036a5a10f9 SHA-256: ff958be690f5d2f51c3889d07944a81db3895b6564147bfd6d0b94354e0d51ef
176 Risk Score

Malware Insights

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

The PDF file is identified as a phishing lure due to its image-only nature and the presence of multiple external links. The heuristic 'PDF_IMAGE_LURE' indicates a common tactic where a screenshot is used to hide a clickable malicious link. The numerous embedded URLs, many pointing to disposable hosting or compromised CMS uploads, further support this assessment. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://etenindex.nl/images/uploads/wivosarajoferopeva.pdf In PDF document text
    • http://kolesa.sk/files/9760385209.pdfIn PDF document text
    • http://schubert-hh.de/image/file/57776701232.pdfIn PDF document text
    • https://webhosting4.net/media/file/natetexigu.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/56044964367.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/41519406800.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/50525050340.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/lidexuxotavixivokanaj.pdfIn PDF document text
    • http://jarosi.hu/files/file/50244746295.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/87254434822.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/sikitafunezojametanebe.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630643529.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/2b9he0imh755d1e3qdh5arj8h7/talipakefe.pdfIn PDF document text
    • https://eetravel.net/file/vewuniwibabi.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16146b3eb77e90---wotesiteruzunezatunes.pdfIn PDF document text
    • https://csn-alliance.com/data/files/96576745125.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/20219139110.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/53843955858.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/94791074637.pdfIn PDF document text
    • http://strap.sk/uploads/files/vizunenav.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-7/20210907070601671453.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16141843b4a314---kutifa.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/39227174037.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305c1a745c3---tosiditazejose.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/29601102245.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=latest+version+of+vidmate+free+downloadPDF 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_off0000b3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D4 13916 bytes
SHA-256: 9dc652c2c34a4d460b322caea681de548a5a188fb623faab43133f98149e6c84
font_01_sfnt_off0000d63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE56 10624 bytes
SHA-256: 4fb8b253ad884e64f665107e3e23d68b610550c3185691f05fc9526539726fe1

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