Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b2ab5f02f9c457…

MALICIOUS

PDF

90.8 KB Created: 2021-09-23 23:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 749a75c7659450b105c8beff6dbbd398 SHA-1: 157e83c9ad053df7687275e2fcf5056a3cf13d9e SHA-256: f2b2ab5f02f9c4577fe71cbe3abaf8244bd783b73db8c3a2d36ee09baf364666
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm and a browser installation lure. The presence of multiple URLs, some hosted on potentially compromised or disposable domains, suggests an attempt to redirect the user to malicious sites. While no scripts were explicitly extracted, the PDF structure and lure indicate a phishing or malware delivery attempt, likely involving a client-side exploit or a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://sassanoproperties.com/FCKeditor/file/rivavatukaxamawamisumata.pdf In PDF document text
    • https://villadorottya.hu/uploads/frontend/files/61305085374.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/71435858906.pdfIn PDF document text
    • http://df-2.de/images/daten/file/sevabipukotatozuvefige.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/87727687181.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/90518584053.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/kipububuvamoworade.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/gojajajeligikutasaja.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/vozakobafemuki.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/47488021238.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/fibovasewekoratepuvevum.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/73929818349.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613075b659082---vexojogilu.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/85693433223.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/dovuzazagav.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/vogoxo.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/wajovefi.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/623ab2ba2a38e322bf2e24a661e857d1/274061034.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/52ba8b3a549b32490633488f30ebe388/63012877202.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/57632924005.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/tewixugamopitoli.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/14219005217.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/28340661574.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/81665421805.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/nafezakifuwibozodevegop.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/19b37a.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/6990172529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=madness+combat+1PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000fb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB77 10480 bytes
SHA-256: 21f532f0ec0e5ab65a0acc0ebfccb1d174036ef1abfd61e645017d8300c390a9
font_01_sfnt_off0001134e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134E 19180 bytes
SHA-256: dcb0f4492009c679cb7862535700dc149d46b6f605b590740f8f4f4ae08478d0
font_02_sfnt_off000145c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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