Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e3154ffc509a591…

MALICIOUS

PDF

171.5 KB Created: 2021-06-04 06:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01e0c8440151fae1e4fe312940401e03 SHA-1: 86274ac906aed0ac2fe0154c99fd69c3f743470b SHA-256: 8e3154ffc509a591ae09a2721168258b2746fb29f86df32a1949b61d998c819a
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which appear to be compromised WordPress installations used for hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to downloading a PDF, which is consistent with the detected URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=verb+chart+english+to+hindi+pdf+download
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a2d8b2033---27100790213.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f810a0e5f---66533356223.pdf
    • http://poorclarescork.ie/images/42543297868.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fbc11d1e7---xalirudeb.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8c5p3r1qvqd6cel17qvgcv39p3/mulopofobad.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/p73pppar8v47j8jrjb7r5i41ge/nagivi.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0f8c3bb20---77537008132.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/5q0maavgfnn9rctdhkv69l5rv6/pekozajoxamebulesevuza.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f23196517---fanepopidesimitamozuwa.pdf
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/55191211296.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160799331a3150---82012352344.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/2k8upklq6ralbs3j6e3cetd908/47902181664.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/mmh95o5llup45ni8j6ufitps3e/titosedurozog.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a67ef7f38d5---79718605184.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/774a9f3d1a1f58933066b68d0e8b6ede/nomawijixol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608474db4ae73---defebipebewowunofozas.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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021844.bin
201cc6ec0d020a59b6660060cb26891c9cca9ef12de87b439abafba60f03cbab
pdf-font-stream PDF embedded font (sfnt) at offset 0x21844 8648 bytes
font_01_sfnt_off00023563.bin
934de922a59fa4f869ce9898c4e9858a8f5a59200a265535f1b346ad090215d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x23563 5616 bytes
font_02_sfnt_off00024888.bin
53ba8958dd46414610a9d24c4be123a7503046853d514b9bb3b31c3ad9c29e86
pdf-font-stream PDF embedded font (sfnt) at offset 0x24888 13360 bytes
font_03_sfnt_off00027349.bin
f752b0327691bec817f24185ed59b09c6d587007f34baa08eda68442b0ae9b07
pdf-font-stream PDF embedded font (sfnt) at offset 0x27349 16656 bytes
font_04_sfnt_off00028ac4.bin
d9b7855245d26d0c148493d26f9adac331614aea430187d84ff0065b47cea039
pdf-font-stream PDF embedded font (sfnt) at offset 0x28AC4 5704 bytes