Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e84b8534d9da134…

MALICIOUS

PDF

70.5 KB Created: 2021-09-01 00:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 30c6fac9678858c66863d8859f5c6c0e SHA-1: d7586a9e23060d1be59747fa9f43e426c45adb76 SHA-256: 9e84b8534d9da134d4dfce1ddd5ebd3c930557ac4030c88db115e16ed362a6d3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a screenshot image designed to obscure clickable links, directing users to various external URLs hosted on compromised WordPress sites and disposable domains. The presence of numerous external links and the image-only nature of the document strongly suggest an attempt to deceive the user into navigating to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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 70 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 https://smidgel.ru/uplcv?utm_term=blue+water+seafood+2920 PDF link annotation
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/4f275cd73fa47f874887a3abd6081831/xibumalogabolizejudak.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ofbqnc6nbffktr406fpj8ldmrc/47930790225.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/tikaselo.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/tupifegojevafo.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/67094162135.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160917cdbab4aa---xawenefuzig.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/dff1f3c9bf214f5f5c64a3bfaac5b5e1/80004371310.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/98343088312.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/fexisovipodor.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/449a390dadd5ad913435fef661fb9b3f/vozudod.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/6nej549q18nkh5g0qlj458rad3/74907530660.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/97890148888.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/gcv6l2j3m2glk3manio7q2ecah/zenuxupaxegex.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a08b4b578---77176708784.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711bef285e7---fesub.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/1f3fb9iouu4hpgoun695gbmnfv/33822307706.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/rakatusomereve.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/sitixiponoguvefejudevas.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611f8e2a5add5---padevi.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/malasutaxawobozilo.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/4584360248.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/83961668927.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/a35l9k1fn3eahn1gsqj1fdv445/pimifagobevobamu.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bd16e8889---47771173468.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebf8274126---83111912405.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_off0000b788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB788 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9A 14280 bytes
SHA-256: 5cb680dced9053874a90867cb3284a4128d5a7d08f5400ab3380721d0c27ba8f
font_02_sfnt_off0000f33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 10800 bytes
SHA-256: 9e1dabd9d82216454a14482e213920829186ab2d7a2c1b4354991baa8123fd96