Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa01424152d516d…

MALICIOUS

PDF

74.8 KB Created: 2021-09-03 17:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ae72625c68e5e7775795ba7eacf401f SHA-1: 0d1559fb4f21356fa999a2165badafef3740353e SHA-256: 0fa01424152d516d544fe271f6c28ccbd05f24338d3e5c44b32d92c709c20927
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://phongthuyphatloc.com/luutru/files/xivaridolututodo.pdf In PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/6f8b550f9924f7d2bce8030bb0c1e8ba/ruratedusoxakalopanefoje.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098467898002---84193210525.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/mesafekajadesebof.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/f2f2a95d1e207407d40863242e05f116/45885192718.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/vomunalevubiv.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/9368341724.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/12024210732.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086102fbdcec---jewojotukul.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios//files/51933386344.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/wusobabinowex.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/boxuxazotewodedobup.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3fc866dc8---bamij.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/mekigimexokobibi.pdfIn PDF document text
    • https://airbays.com/userfiles/file/tidofepafolinemez.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/qt1mkdk17vj0qj4pk6gq81jak0/nugudidetuw.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee01f45016---nirupiwepupevojofagaki.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/madapewulawenatu.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/e4a8062a51c133f6542e85a2db51df66/kigifigasuposatazirin.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082be2081fd9---34962497432.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/rfglhb373khhs75v8e5rjmrdmh/65974551617.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/27e45d30e0cd19320ed241c9359dc3dc/91590130938.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/j2ogaglvrd1h4ego5dtb4nr21j/balilo.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/3110582687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=financial+management+pdf+nounPDF 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_off0000c266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC266 10772 bytes
SHA-256: e0ab21bc6fa9d4156a18fc3ac63e7b0835343ae80b2e0acf61b73301dafd9706
font_01_sfnt_off0000daee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF300 16468 bytes
SHA-256: 847e856f272019b5e0c75f319e683d62e144451c063fa905187238d95d25cf19