Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f651bd71d555079…

MALICIOUS

PDF

75.3 KB Created: 2021-09-06 10:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5bb8989c7ebeb2487c54e9cc9187e31 SHA-1: 7b1840b83e169ae8a74f1124933feb5f2bc5c53c SHA-256: 0f651bd71d5550797a3893191fac0fddbce850bd0b17a7fedfa307721ec673f3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple disposable hosting sites, some of which are compromised WordPress uploads. These links likely lead to phishing pages or further malware downloads, consistent with a credential harvesting or distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=scanned+documents+to+pdf+converter
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/68df4af5f0b068b005764cdf9b752601/78530774522.pdf
    • https://t2sc.me/userfiles/pawarozexefuz.pdf
    • http://sake2metustin.com/uploads/files/mobixejifanubekal.pdf
    • https://blogsma.com/files/roxonufenuzosokutu.pdf
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48938475902.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/9e6t9l2cnqqibn2d2jhadsaqv7/xetijaganudupasuf.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b8a29046c791be3769a258bae9571792/vavotarijoxagepenireru.pdf
    • http://launensia.cz/ckfinder/userfiles/files/ximutezenetasezaso.pdf
    • http://naviway.su/upload/files/6023309254.pdf
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/dobilabuforuzo.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606da4212c3d9---minexezujemupukut.pdf
    • https://castilloexterior.net/ckfinder/userfiles/files/luxutodalabefu.pdf
    • http://banner-ever.com/ckImg/files/zusagikimes.pdf
    • http://kidsjeodo.com/images/files/41449680819.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/9deba6034875b3ccd5fdefeba4f731bf/70381565928.pdf
    • http://prakseologia.eu/userfiles/file/nekuzolaperozikegakegukof.pdf
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/88387940531.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160785ac6ac51b---fexonaxogagobabidotibiw.pdf
    • http://curry-box-deluxe.de/userfiles/file/34045918950.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/a8af76f5e6494ae0a15d7a294a0e209e/86214893128.pdf
    • http://accessoriesunlimitedinc.net/catalog/file/zubukuj.pdf
    • http://landonintergroup.com/ckfinder/userfiles/files/71593137174.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa45831fc2---68037817312.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/u4ls1ok4fh1kgfimue1l5jqjfo/gotosukajofinokopuze.pdf
    • http://chistogood.ru/admin/ckfinder/userfiles/files/lagatarijozonaraxodozi.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_off0000c4aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AA 16792 bytes
font_01_sfnt_off0000dcbc.bin
b6f40d4941242882d8ba1eaa835313a7b0e0f0ff347e60d523e143014de5eb3d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBC 16028 bytes
font_02_sfnt_off000105b9.bin
d75283010ca3b61d99a9189533ea27b56517b508842b1afec843c2c05023abbe
pdf-font-stream PDF embedded font (sfnt) at offset 0x105B9 10884 bytes