Malicious PDF — malware analysis report

Static analysis result for SHA-256 de518f44baf381ca…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 02:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 573587b10f72b2cfbbc93bdb814011ae SHA-1: abd474a73f66eac8a9bb02a1ea5bf29e921292dc SHA-256: de518f44baf381ca05ab11e51f2b54bbfe8a5a456440a99e72b8002d1860be77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=how+to+send+apps+from+one+phone+to+another PDF link annotation
    • http://dobre-jaja.com/Upload/file/4895425786.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/suxuwoguwezeku.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/23590698153.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141dcaacfafe---23688042813.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/mb2j505kij9b96i8kbmf2r52qi/pajozezunososenomepemo.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144d08c78fc8---nawofus.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/2j61g9hga08qsi8rbd4tlvi695/sexapavidiwufefakamudala.pdfIn PDF document text
    • http://email-database.info/userfiles/file/pidaberijosomewaxibuve.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/67879034733.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/puronezafa.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409282195aa---pusawodimoxokoze.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/jigarupikaduzofudululike.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c2ef789d13a655fd1f927fa9bafb5851/96120119271.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/40639951971.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0ec0561cc---gafebanatipatenixituko.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161443dd4472c1---vulomeseji.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/tubabe.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/12584521936.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/84152909952.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cacb626bfa---bisigibusuko.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441559d1131---zivokidokuvekexekojinol.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/27852251964.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4bbf47c26---74091761559.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/mamugiwitanada.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_off0000b5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AB 10704 bytes
SHA-256: b103a67690fa15f2ee5bae5bd24ab33f8d3b030f65ae3c4c930d29b998c908b2
font_01_sfnt_off0000ce0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0F 14300 bytes
SHA-256: 166b0ec9b134021d71b7137a92d64d01ff5851c06672ff25a1e98d0b192698a0
font_02_sfnt_off0000f1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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