Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a52e52436d4248…

MALICIOUS

PDF

97.6 KB Created: 2021-07-31 21:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 866d15c327f6a5d65084427fa9c672ca SHA-1: 47aa1cce34cfda38f9dc75e63a934c5c0a3788b7 SHA-256: 33a52e52436d4248013406e397960d3eacedd8581df8e8ec9eb731f6e9844383
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the ML classification strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://normel.org/files/upload/file/xubunuropanufum.pdf In PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160765a998a496---72615076610.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/kidobeguna.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/gaifc3607mf23rhpr8r2srvalc/73754684080.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/tigeputefofenegu.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/43156552168.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51e05be642---1836701084.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b24c987104---51538664975.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/iii4qehpehi1bh31hfb1vnu1n4/lidusagozamukafi.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160be84cbeb019---225849837.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/3r4ta2v72ur7gi7mvnbblumtfq/rexezogepilidorexoxewuwel.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/d05fh2a1kvthe5tadpin9tufln/69070301800.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/kunub.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/e651567d9bf90acb6cf667ba34780f65/51058755033.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/akj8ltd28b2mbt6ia19s590shv/79412634783.pdfIn PDF document text
    • http://rld-carbon.ru/file/vadavurazazonukupo.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/jamulalevoguwepap.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202106260417116230.pdfIn PDF document text
    • https://stopserv.ru/files/file/35774237788.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/4369ff140674223602a9093b8a7ac538/loluxulivitagerezavodik.pdfIn PDF document text
    • http://mesterek.net/tmp/15937880980.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f0faabd43---14825543611.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c84fb9cee---tibovefalatakibubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=nsdl+e+kyc+pan+card+apply+onlinePDF 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_off000103e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFA 16232 bytes
SHA-256: bf3ac2bbc5511ca59b022801f68684aa2b8ae7661b1a55c6866fed5ae8d27d0d
font_02_sfnt_off000131dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DD 10592 bytes
SHA-256: 7858fef0fb311583eef1c56a210986ff5fb7fa13c2e6ece3b72abdc122ab6ab0
font_03_sfnt_off00014a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A25 17480 bytes
SHA-256: c23847ef8ce138abd8a3d49d6f55bd3429c19233833371a158621911d26b7fd6

Open this report in the interactive analyzer, or submit your own file for analysis.