Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7feacddc0e2dc6d…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 11:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5a0eca4d1ffa044df7b5d1048764d03 SHA-1: c8c2b1b74aa4fb8f25459146ae0128a599fb25af SHA-256: a7feacddc0e2dc6d996dd0334d110629d00355cbb79049eaee4d6b332c9b1e83
196 Risk Score

Malware Insights

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

This PDF document employs a social-engineering tactic by presenting a lure to install a browser extension or update, a common method for credential theft or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it acts as a dropper or phishing lure, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://livestocktool.com/d/files/luzoxobixajugaxasipu.pdf
    • http://bsa-billiard.by/images_from_html_editor/file/zevalezobudugazetupudo.pdf
    • http://aasghsflqsae.handylover.com/upload/files/81640879774.pdf
    • https://emtracing.net/userfiles/file/37172322206.pdf
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210908190225.pdf
    • https://cottonweb.net/userfiles/file/rufuxutazetozititanutos.pdf
    • http://studiopedrazzini.eu/userfiles/files/86607361860.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/3bde097b28cf18b7918ffc15bfdddbf6/mibujik.pdf
    • http://studiomanzetti.it/userfiles/files/39409546489.pdf
    • http://vita24h.com/uploads/userfiles/file/subinabalaliwipobipi.pdf
    • http://carrozzeriardue.it/userfiles/files/69371791497.pdf
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/41296265498.pdf
    • http://mastrodibaglio.it/userfiles/files/46825046501.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613334a89b197---rebeka.pdf
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/fotizozifotirivajuzi.pdf
    • http://www.fashiongale.ro/userfiles/files/5751892003.pdf
    • http://195exim.com/datas/files/51154078280.pdf
    • https://asztromiskolc.hu/ckfinder/userfiles/files/50145964501.pdf
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/jobejukapawudinemilus.pdf
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/41655506073.pdf
    • http://ahzycw.com/upload_fck/file/2021-9-4/20210904040257832375.pdf
    • https://youkuvpn.com/upload/files/32978878652.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ljo539h98pbhdd8gc9c92gsgu6/82289668825.pdf
    • https://aspirans.com/files/file/67292079319.pdf
    • http://designbyjoseph.com/uploads/File/fugudoketegogef.pdf
    • http://nadiadsa.org/userfiles/file/30954751086.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=transfer+image+from+android+to+iphone
    • 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_off0000d8d6.bin
d544016f820bb32623a0bd55f065b76dd4592cbb826e416667b6569e4c819c03
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D6 10860 bytes
font_01_sfnt_off0000f187.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF187 16792 bytes
font_02_sfnt_off00010999.bin
a30dd58f77c0668283b71888ce79c2a5ec177be5e8ec586dcfe37c2499d930a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10999 17360 bytes