Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4fe35b83165239a…

MALICIOUS

PDF

78.6 KB Created: 2021-06-30 22:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b242edc3a9cdd5f6309dc2f38b2bec8 SHA-1: 02bd8071ecdedff20097070b514b4a7a829ab582 SHA-256: c4fe35b83165239a899af0ede2bf77879ebb2bbca4cc098ce68565daeba18715
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://coretry.ru/uplcv?utm_term=charles+dickens+ppt
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/dfdf25cd91fa3728f2f1244b903ff6cb/wepomifugavenowi.pdf
    • https://ikincielinmak.com/upload/ckfinder/files/sazuzeliveroge.pdf
    • http://anhuicrew.com/upload_fck/file/2021-6-1/20210601091008330519.pdf
    • http://capital96.com/userfiles/file/95270354164.pdf
    • http://myshopekerala.com/userfiles/file/xeniparijur.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/36637783786.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/1c20ugoe6ouucqmnd8u60l2440/26916234388.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/8570e2ed813fc364615cba10589ba5f3/18764802550.pdf
    • http://wojno-stal.pl/pliki/file/6036916059.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608924df77673---1680031136.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608362eae968e---widomujajujomu.pdf
    • https://alibabaoman.com/basefile/alibabaomancom/files/fuzitire.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a344c600711---pakovolalabowinodibuxal.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cbb3c62b2---logaronuwanemadegaza.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/dedenano.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/fe785e92912b1b4f074b190b648694ed/vajub.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/be3fe37f5f91e530a3bc31905eb966f0/42645935068.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c29211ac42---20038301082.pdf
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/wagujogasadinixepokeru.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/rowibesazolawapogewavibe.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160855cc633694---31403948166.pdf
    • http://www.findvoters.com/userfiles/file/kizokavag.pdf
    • http://aire-limpio.com/img/editor/file/golopa.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9aacfbfcb0fa23972c41579e12aa893b/88283050299.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_off0000d330.bin
7ef20d12c61ece9295ad3a129a8483e5b6baf5e0eae398c81571c8aeb7a9e325
pdf-font-stream PDF embedded font (sfnt) at offset 0xD330 16104 bytes
font_01_sfnt_off0000fcef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEF 16792 bytes
font_02_sfnt_off00011506.bin
8c1858d212217602571a13862c4cc08b0b21e3d7488a351c316aa242bdcdbce5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11506 10616 bytes