Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7bfa91b6cab42ea…

MALICIOUS

PDF

131.8 KB Created: 2021-07-24 20:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 573f4e10c6a9dc87ca43dedea3e94b1b SHA-1: c7d3d0fed24b549efa7b140b9c548b44fe4d3295 SHA-256: a7bfa91b6cab42eaa3d21d63695fb06d9fbb99a830e7c7863d0ecd3fe59542af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9157

Heuristics 6

  • 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 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://rw-hse-businessconsulting.de/userfiles/file/xugapipigepegubupidatu.pdf In PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb4419f61b---jigafaxoxofewiragukupuvu.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/9974daae67eb72af695f3a706a89e169/vatodisufesezazet.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/h8nkb8e47oetpp9brrbb27fde5/musilitifanaf.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/88247736435.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a236bca3bd---kivid.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/gn55qqrcmaidldu7ffkrpmd43t/maferonadowizig.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/13337710228.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//vewulu.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f2de2998c---72675571067.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/dq89a3l2qht9btluojm5p899c1/tigeda.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/lff7angakp50anlmr6fenb6vvn/21563820787.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/nr9gc1860jln0lvfeul8p0vjbq/bofegixavokurodi.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/pimira.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3112242505---99354066392.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/lemomurokofavetudiwowozi.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/aq663jequf611qq0bi3580nhg3/20614014818.pdfIn PDF document text
    • http://huntland.hu/upload/file/loxifebedogerunafoleda.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/45766130121.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202106112236218503.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/nukarodijosudit.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b87c4c2d5---18551777099.pdfIn PDF document text
    • https://telenovella-bg.com/files/vuguberokiletupufosow.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/dafefidozakomol.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/6812415247.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/e830b7848d988d3b6d7727fd96c7ea01/gumeda.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d0af25448---67429622586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=realidades+2+capitulo+1a+2+workbook+answers+page+7PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000188e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188E4 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_01_sfnt_off00019e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E61 11372 bytes
SHA-256: a26d67bf81a087e080cc26c6b90b7571eeae09d10541d9d189bb57d6a4687d47
font_02_sfnt_off0001b910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B910 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001d122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D122 17668 bytes
SHA-256: cf9d75e53d7a78497fe8b9b8db00e90b2c261de70741a73089b48d9deb0be9db