Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e82ade95aa6ccbb…

MALICIOUS

PDF

83.2 KB Created: 2021-07-16 14:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6fdd2d80057a8b227f4d6e7e46ef1370 SHA-1: e8ceda287aec8c883779a4bf895ba52ef1c54ee0 SHA-256: 8e82ade95aa6ccbbc96f10f36db0790929f70651e78f4702bf1c6406d52a6495
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and a large number of external URIs, many pointing to compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded JavaScript likely facilitates the redirection to these external sites, potentially for exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • 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://drafthe.ru/uplcv?utm_term=business+studies+class+11+chapter+4+pdf
    • https://elesud.it/img_pagine/file/jutofodikonafi.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/a230547bbf71591b58a5599d47a47789/12274128681.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081386f9d13c---vokukibisatuperupariri.pdf
    • http://winso.tw/userfiles/file/24417634815.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/2696bbcae2f0bcbbdefbd3d1c43ec3ee/88027084675.pdf
    • http://rolmech-strzelno.pl/Upload/file/koviwut.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c00359844c---61884735302.pdf
    • http://kcntanduc.vn/img_duhoc/files/mekokujujenidedonige.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078a0cb2ef07---vifodarusujikafubudomava.pdf
    • http://analogsys.com/uploaded/file/1971228008609b1feccf86d.pdf
    • https://playerpress.com/ckfinder/userfiles/files/22433470911.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/gufhcbnlknfer9l04bac6t77un/sinese.pdf
    • http://adamshs-pdx.com/clients/d/d3/d3c120c733f7363e2cdaef2cff5f3687/File/tirowolo.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7bd965d36---60013283755.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/63f4d1fb73b45905b15b90b13285d95b/20925423482.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3cd139740---vejagazumorugopu.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607caa64f1fc5---mekowuzofa.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/svucg69tg4p8gld125mt1m7475/xudakijodegim.pdf
    • http://codefon.hu/js/ckfinder/userfiles/files/vifoso.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/30a734d8705cbb1da6599deff1fc3efa/pibevedusubuwu.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/faf693d80802b4ce1edd13e5ea422ce4/lutino.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_off0000e395.bin
fb781fdea710f74eb57a8181aae21e7160cc717769c7168fe9f9448ae7fa7fe3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE395 16588 bytes
font_01_sfnt_off00010e7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7F 16792 bytes
font_02_sfnt_off00012696.bin
09d9ec65ef32db33cdb6ed804717d53d57545f430aea69c2e1d43a9ac636b3ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x12696 10880 bytes