Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a44e201a8a4c9d…

MALICIOUS

PDF

88.7 KB Created: 2021-07-18 14:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3110837dcdd2f265b1cf74da5eec5468 SHA-1: e0072dbbd2ffb7f007ab20f9b8d61e33a71fcbff SHA-256: 44a44e201a8a4c9d9f738d62c245173d09ee87c6cafdd577a26675a96f36a235
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF identified by ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. The document body is heavily obfuscated, preventing analysis of its direct content, but the heuristic firings strongly suggest a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier clean score 0.2381

Heuristics 5

  • 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
  • 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://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f51b4572f---32874466163.pdf In PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ff5c5839f---53388839585.pdfIn PDF document text
    • http://effektfilm.de/files/file/gigulabegubedubi.pdfIn PDF document text
    • http://furniture83.com/upload/files/kuzunuse.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/42053404252.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/cd570e63392d2d8d0ec6c4806f5d1144/61632901443.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/44009876191.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abdded7c153---4494531985.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/pibatasonurigilanoxowup.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/83c1b43e7a65bd58c9342ef82e32c479/67234103289.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80ad6ee8f3---14269294936.pdfIn PDF document text
    • http://netflor.pl/upload/File/labalubesaw.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609e12b4cb211---49568302924.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/gamaniwival.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ii3or4lq1r73sh4t33ig0sgf69/funovoridadeguvelodis.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/6adc43cf4a081855a34087639dbfa5d9/xawaxefopani.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbad9c60d8f---43909485922.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074c7310ee53---4580120711.pdfIn PDF document text
    • http://greenld.com/userfiles/bafirikij.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/af79b8c5f481a75898d36783df8b57ad/tatuzibogapadebaponi.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bb53bf5d3---medukixedekexogatitojixo.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f015cbd28d8---zutakobuwog.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f47e666d6e---fejomuzikisagomebopa.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/36a1f0c6d1e532becaeec516981c09e1/55088225801.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/supiwagiwi.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de00e861fc4---51336713731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=basics+of+everyday+sciencePDF link annotation
    • 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_off00010226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3D 10556 bytes
SHA-256: 45bddc790543f156b81e19dc35537eedb56856a6cdbb62bf4a0c4bd2455aad42
font_02_sfnt_off00013281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13281 16868 bytes
SHA-256: 2729c9a3f693a695e8f9846e05250207683ade095b4fb42e81b72acd0f275a63

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