Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e57e922e5690f8…

MALICIOUS

PDF

83.9 KB Created: 2021-08-15 11:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a1ffbd1334f8f7eafb34cf06c97ce997 SHA-1: ba3cae0544caaaf43d0829a708874b03962ab71d SHA-256: 11e57e922e5690f8f4db03c7fbc3aef30fdbfc3309fc9096b7a7d575ba3d7ff0
236 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ClamAV and exhibits characteristics of a social engineering attack. It employs a 'Browser Install Lure' and 'ClickFix' technique, instructing the user to install a fake browser extension or update, or to execute a command, to view content. The embedded URLs, such as https://pistant.ru/uplcv?utm_term=computer+hacking+tricks+in+urdu+pdf+free+download, likely serve as part of the lure or lead to a secondary payload. No scripts were extracted, but the document structure and heuristics suggest it's designed to trick users into executing malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 https://pistant.ru/uplcv?utm_term=computer+hacking+tricks+in+urdu+pdf+free+download PDF link annotation
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/83332073247.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607657cda733c---dorovib.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb7ab70409---dozawitusalixeki.pdfIn PDF document text
    • https://ccskin.com/geektic/files/zidego.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/pekogidakuxexugudupuve.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/70079428083.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cee90fa52ad---jidedafuz.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/327c575c78b4d8bd0245ab5960caa46d/rilivegolozizovurubatatil.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/fupobojeludonovoxabifo.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/82586099553.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/38694622204.pdfIn PDF document text
    • http://web68s.com/upload/files/55986981722.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/bonani.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/93941240232.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/70337212389.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/limalezalafem.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/0e2f283d492f5f68a67717900dfcab28/tatudezikalijejusu.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/38295960684.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29390532489.pdfIn PDF document text
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/sagopajutudifuk.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/68761640414.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c75ef17839---61172646281.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_off0000e2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C9 16504 bytes
SHA-256: 8b4108374751e419ca2cdcc7eb6892023667a8f90fa35ef1ba59131b9ce14e71
font_01_sfnt_off00010dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBF 11376 bytes
SHA-256: ed03849800395a3eac33173e7d0c856f380695919770763847950ce44af6e340
font_02_sfnt_off00012845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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