Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0833d61399ae384…

MALICIOUS

PDF

85.3 KB Created: 2021-06-30 05:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43234e0fe01d76f41122fe075d7ff34a SHA-1: 89f14b667958a86dcbc10c5c514d8bfcd062b771 SHA-256: f0833d61399ae384ed2614688292dff723f35e8276bb253ea69ce78695f73e96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting it's designed as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://crewmak.ru/uplcv?utm_term=what+to+put+on+desired+salary
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608926abb39fd---7425757711.pdf
    • https://apc-algercentre.dz/ckfinder/userfiles/files/90496014640.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9441a436c---nunoruwikimok.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/3d24896851193754849c5c7d6ac135b4/mabomexavujurapenexe.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0e9ca22b0---30193345469.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa3fa6fc20---lamixolov.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160821b2c27d01---lamukefixinezunemefipane.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/1fml0akkvkp53aqlejbgtilk37/76147383453.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607678fa40d48---48151355245.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/758a09e9010660bb5439947744e6af3e/37434128693.pdf
    • http://jtylek.pl/Upload/file/bokotoxodaxebuziwori.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607224db51584---werajadudidurokew.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/d0c1722a66e531ac0093e94b4b3d61b7/daxoferijixome.pdf
    • http://aite-materials.com/upfiles/file/nawekegogamosirodexapin.pdf
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ahl2blf14itmh30d801i8pge6/momobo.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/2dbcbf93f72e063ed3826d63960aea9c/80532937043.pdf
    • https://feltshoe.com/userfiles/file/31076210062.pdf
    • http://abwplazaview.com/uploads/files/29558602527.pdf
    • http://cn-daomeng.com/upload/userfiles/files/70083cdda7e0a40da5c1add0d794bf7e.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/tizasokufex.pdf
    • https://coastalstudio.com/images/main/file/nalugizetisowo.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080f52947e9b---jututorimisabapizimonuja.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16099ff6db4063---bavafizikimobatasevo.pdf
    • http://954move.com/clients/4890/File/wuzapasizakubuwa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea5d.bin
56d7e1cc65f855bdd5b2d0798d6c902b3e0b6f5f2902a4d6e0c6bb37300310b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5D 10696 bytes
font_01_sfnt_off000102e2.bin
0f3cae1e936e9d6a8032d3a99eab2f03bb8f57292e1c676b1f0786d99db50c3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x102E2 16880 bytes
font_02_sfnt_off00012e77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E77 16792 bytes