Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8e25338950a269…

MALICIOUS

PDF

91.4 KB Created: 2021-07-14 07:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7140dcb93ae789bd6a179d7dde54cc70 SHA-1: be49ff2c81d134fae6e3e543289f279594861dd8 SHA-256: 6f8e25338950a26961b2010e225c66b984cec1ffa6cfcf89c612db503d8a4df8
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was detected as malicious by ClamAV and exhibits characteristics of a phishing and malware distribution attempt. The embedded JavaScript and numerous links to external PDF files, many hosted on compromised WordPress sites, suggest an attempt to lure the user into downloading further malicious content or installing unwanted software. The 'Browser extension / update installation lure' heuristic strongly indicates a social-engineering tactic to compromise the user's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://bezagsecurity.cz/userfiles/maral.pdf In PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607630f78cb17---zetiviwonix.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607545ae0e466---32850694881.pdfIn PDF document text
    • https://loctra.net/userfiles/file/gofadotaja.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/xonasenumixapakopi.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/98088480135.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/32199826082.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/82851780720.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a4925a36a6d---63804301961.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/5blg38tpf26mv2jc9rstg0np15/bedamegokokuxijunoxif.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073203d4efed---34851200146.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3892d2598---52046748332.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f376b77f0a---raduvimerewawaduvadavuw.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8eefb3228---negenawej.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/iprsbhimm06efs7s9qibu047nb/kiwiduruwa.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210611113226.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c661a67689---62832692498.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/wijiromejanitisezu.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9540db2e0803a05ae9f64b74fb9d6102/56538586022.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/57493472000.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/64893dc0bebf1b765d69cf969fedd5f4/fudulepesaso.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/siwadudejajawivigok.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/bee6663b7447cebf1da03afb0d0e1a00/2083366137.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c2ebb7fe3---lizonuserafog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=shrine+of+the+most+blessed+sacramentPDF 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_off0000ffaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAF 17704 bytes
SHA-256: ebb1d5a9e71e8610d5e022cc05c596dcf84fb2d34c5de2f193ccad8ce61d5513
font_01_sfnt_off00012d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001454d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1454D 10956 bytes
SHA-256: 359252cbedc564f2de442899441ff3475dcadcf9760f0de669db4b4d06f1f59f

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