Malicious PDF — malware analysis report

Static analysis result for SHA-256 c46087ae84398055…

MALICIOUS

PDF

93.2 KB Created: 2021-07-27 23:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1662d4a04c671f306cf16a8b906ccb3f SHA-1: ea2cddefec284a2442ff40a83377400e60c91da5 SHA-256: c46087ae84398055dcde6f978f6d08d848becb230de3b41e4a510d8cbc1f4155
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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
  • 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 http://eau-msu.ru/ckfinder/userfiles/files/xuvulekora.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/683a93a90372b28220c3e86ef2896787/9831424102.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2855258c5f---51045315165.pdf
    • https://pioneerlift.com/upfiles/editor/files/xonikore.pdf
    • http://sushistoryus.com/uploads/files/9293621092.pdf
    • http://tourbusan.net/FileData/ckfinder/files/20210619_7A62EF7B6226F3BA.pdf
    • http://botosani.ro/img/uploads/file/89890109876.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16084e1294d86e---99653696389.pdf
    • http://hopsch.de/uploads/file/peganosajozibe.pdf
    • https://bdata.vn/upload/files/40594139783.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/6c6c08acc7d68ba7661551586ea2ed24/83981203596.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160abee3960fda---nenosabodupozuputipo.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/kepogos.pdf
    • http://ssujaxchapter.com/clients/83257/File/50916658074.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/04b7231efd4e476cd49cca72841094e6/1288500181.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e707616f0f2---lukupaworivonepewufepom.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/6d5c54469d1614c5231d2d977ec8e17b/xabuvilowovijaranakoza.pdf
    • http://altelaw.com/uploads/image/file/94881007829.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/hog5tl01mvrttcnkieo7iqdojp/20973922081.pdf
    • http://thegioituigiay.net/uploads/files/zelik.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/tg582a6nr1tsqvf6os11d4i3oq/10180999855.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8d7e6c0a4---84954758903.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=th%C3%A9r%C3%A8se+desqueyroux+fran%C3%A7ois+mauriac+film
    • 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_off00010248.bin
cab6e26acbd77b58d67a066b2b9a45591b1dd2ace289a1f1cabb7cfc53188b86
pdf-font-stream PDF embedded font (sfnt) at offset 0x10248 11576 bytes
font_01_sfnt_off00011c62.bin
7ea75ccbd709bbf2acd1e5aef7487f518250a22803380b64f472b8f47e7e1bd6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C62 18912 bytes
font_02_sfnt_off00014bda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BDA 16792 bytes