Malicious PDF — malware analysis report

Static analysis result for SHA-256 1321d5fdc5d3f680…

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 11:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6767e73ab01d149ffb9bffd258a52757 SHA-1: 2b99bdb6c639873c6b974b7387b80ba12702d25b SHA-256: 1321d5fdc5d3f6805685f8fe7cc709db7c11d9d1f39797872cf6dd20e59455b6
204 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, and it contains embedded JavaScript. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content is designed to trick users into installing software, a common social-engineering tactic. The embedded URLs likely serve as download locations for malicious payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=secure+browser+apk PDF link annotation
    • http://studioguidobarbieri.it/userfiles/files/padiwes.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/65170588375.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/tipenoroximisa.pdfIn PDF document text
    • https://birudongker.com/contents/files/talevazudidikatilamuk.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/9ad7d6990b0e7e85db6c6919cc63dee9/vokiwusal.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/kudorosamigavix.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/27bkkbq8h8hdt751u1feslfr37/17357106449.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/73375132889.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/70923292341.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/88421291194.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/rixenatoteworita.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/83645484650.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306fb4a7896---59260336420.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/62546716376.pdfIn PDF document text
    • http://odumakus.com/uploads/files/kesilobivosukomom.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/66521025443.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/88756880344.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/fixidanelafatupogugeli.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/11770448933.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/jimetap.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/vekefexirajonasuguvugare.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/jarokejiveredunikir.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/sitisonofugitep.pdfIn PDF document text
    • 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_off0000d547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD547 18272 bytes
SHA-256: cc903f2b1ebce52fe85be3c6e34378379b18917c7eaeb0cc89b49ff0b6efcd09
font_01_sfnt_off00010564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7B 10520 bytes
SHA-256: df82dbd16bd3095cf1bc3800644ff4d2aa555f37b39ecae63ef3725075d3209a

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