Malicious PDF — malware analysis report

Static analysis result for SHA-256 082010c01faeb74f…

MALICIOUS

PDF

70.4 KB Created: 2021-06-25 18:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9d11943811f83ec8000f326ff537da1 SHA-1: 5ae1ed0e481b1ceafff678f1aed7914a7c31ceb7 SHA-256: 082010c01faeb74fa2f26128920a48f29b774b8935f697293704c4848f971aed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for redirection. ClamAV detected this as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious, supporting a phishing or trojan delivery attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://toskov-yordanov.com/userfiles/file/59212799053.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d89af19d3---85963659293.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/8eq704alhd56divcm5ihha9ma2/refilum.pdf
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/vakezinodasijivenivuded.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/ac7ne6b8hf7m26vf29lmpc5pkk/38260872787.pdf
    • http://rafaelokazakov.com/file/48132793227.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1e910099b---37012556726.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/529275d4cabc2352ebc7053272204bb3/wajafazoxevisir.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3631092c66---tatul.pdf
    • http://sgrappresentanze.eu/userfiles/files/60927450701.pdf
    • https://adasms.fr/userfiles/file/65666995969.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080c30bea2a3---41360266035.pdf
    • https://alianzatours.com/imagenes/file/83319182325.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/7432eadde6f996d04da58dce1a769bdc/pimomiv.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/0ekv8vllt9ibvs8orvoj8ibus2/42630530250.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/5m7v4ppp1jbjdtuhr9bdrpa9fh/fupisepejad.pdf
    • https://advik.net/userfiles/file/17797722655.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/bb0bd287c498d00928464e60bcf6e91e/41111692491.pdf
    • https://ljlconst.com/admin/images/file/tokagowexalefitugojirad.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//milupagew.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077e9f813934---81351283370.pdf
    • https://amd-export.com/site/upload/file/67685518251.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/srd0lage3ov46g5f6c2iuuc1je/pezarenogovana.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/548dd822amserdsqqra0iohtmn/49289685601.pdf
    • http://legalinet.eu/userfiles/files/jufemekunozelib.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608780faf1f33---45028452722.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=clinical+ophthalmology+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_off0000b52f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB52F 16792 bytes
font_01_sfnt_off0000cd46.bin
82656320138c8e87c2971cbe1c7000d41799d6fc2818b97a6a2718db7dd7144f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD46 10812 bytes
font_02_sfnt_off0000e5c3.bin
722d9d1ff8310461006279ab9bfdbb998064b65e22db104c8aaa90dd8cc2f63e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C3 15112 bytes