Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb266409f395948…

MALICIOUS

PDF

79.4 KB Created: 2021-06-30 02:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dcb0f12045e620bb77a6023e7f101eda SHA-1: 57365a11803d199c127fa44de7bdb1499a394049 SHA-256: edb266409f395948002651a420c900ee54fd6bc87ce6b2b0bce9bfc6a797a75a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories, likely serving as a distribution point for further malicious content. The presence of these links suggests an attempt to lure users into downloading or accessing malicious files, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/9e7c70357c71aba6942980e1b105e909/325036887.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a101306ecaf---pezupunemurusujikiw.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/vgsao1n2g8mv3ge3eq5d5621j2/57664534826.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5bcff9d237e3853df3df5b6193623348/12226463957.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/bd2e8fa62ace090f00bf5b5c2ed04c6c/46867367788.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/bca1688e921910397579db85c225cc55/kuxogebabarukejaz.pdf
    • https://roc.mn/uploads/files/67501680068.pdf
    • https://fajanav.com/aym_image/files/fonajesijunumasigawa.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/182a4c8befff94f29b63d65145417013/tafitagen.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2lm5vgun95jl6d6c3t16vfol3i/zemaxux.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/1b709b819205d00d35c353455e7ffd38/vogil.pdf
    • https://stijsr.com/userfiles/file/najunalovexigugeweboxi.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bb341623e---rebimawafisuta.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/0881fb8555d039eac357b212e76845d5/62630231186.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/i14k5lhcopk6putsbrqt4kk0k6/lomofevanemidonaf.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/e1cf28f8af536aeb5cdadfe21a3c5c13/58964081660.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/78ba57cc632099bfd5a3537d6688421e/68297085579.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/a5c4ffa98b46e94c4bc45891390372eb/90889576990.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1ae2943dc---sakarap.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/9009e2449836cfd858c06619c854502a/84120544979.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b017c25945a---vudubowezafopuzo.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/83344501ff196ed4dd8bb60a2d540fee/vajeneduvazixuvubu.pdf
    • http://tdvvietnam.vn/webroot/img/files/67431311853.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0f130b01c---70516033157.pdf
    • https://actorconseil.com/files/file/64000509021.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160861d662f396---68875488491.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=html+pdf+to+word+converter
    • 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_off0000d621.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD621 16792 bytes
font_01_sfnt_off0000ee38.bin
2fbe28a610d3a644580ebdc67b2c46ce2248003b0f7d885bd4a7b0ebb292205e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE38 10504 bytes
font_02_sfnt_off00010612.bin
583705f15977d3c8b5d536eec0e128c66a72e0c2c7726e98a94c0de3282edb1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10612 16392 bytes