Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b56d23b2287f7ca…

MALICIOUS

PDF

87.8 KB Created: 2021-07-04 03:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cbaabbe613223f6f7faebd8f7c63b90e SHA-1: 69cb36702a42b762560503280b82786b461fabbb SHA-256: 7b56d23b2287f7ca62624a5674dd4ec2fcc5150fb6240f28db2851c7593745a4
196 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a social-engineering lure, specifically prompting the user to install a browser extension or update. This tactic is commonly employed to facilitate credential theft or deploy further malicious content. The presence of multiple links to potentially compromised or disposable hosting sites, coupled with a high ML classifier score and ClamAV detection, strongly indicates malicious intent. While no scripts were directly extracted, the document's structure and heuristic firings suggest it is designed to exploit user trust to execute further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://school19-zav.ru/userfiles/file/digedurog.pdf In PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/7f02810e7107a927c58b5857b7247eae/73397125882.pdfIn PDF document text
    • http://land89.com/ckupload/files/77151474143.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609547b1c5c99---pijifugetaxixasi.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/povepok.pdfIn PDF document text
    • http://iwishop.hu/file/ledujofuwa.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/j3p81acva75pjarjc87i3v70e1/232414022.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/87395ca46cee21d1400375a1cb046fc0/42886993191.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/6480594195.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a48e614b5e---vinofabarefok.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/84085130765.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/1fccb7abd3225780dc65c0e94a00e2a9/27591188141.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c58c999c9c---27603807924.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/lusunoxi.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/7fbb6d80fa01b97ca4c4605104608bb9/rikowego.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/m48poueppca96875bqe4ht65pq/42352135333.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/d253d82bf1da7ef04cbbd053641d2a4b/22499303411.pdfIn PDF document text
    • http://siembra.me/uploads/files/vojafatofiwibolazusop.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/xulekasasenelofe.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac880151365---45352149376.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///94871586895.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/53qcktavp0hfn6907fhemmk22c/bokinofafalipixe.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16075db27f00da---72804000228.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/xanatanapif.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/guwelokat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=treat+your+own+back+pdf+downloadPDF 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_off0000eda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA2 19316 bytes
SHA-256: 8b3071164dbd684cb00d3d6703fe84210089745aa7248c29d6e3a02579c889da
font_01_sfnt_off00011eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEB 10848 bytes
SHA-256: 41a3bf50160e3fc3b110e685314c9b1055b60e27f949ccd969ecf03c7a8c2308
font_02_sfnt_off000137fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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