Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b67b0ba546d83f7…

MALICIOUS

PDF

100.5 KB Created: 2021-09-02 08:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2869207abea9d05305c1b6cc32b9f2c9 SHA-1: 06d35b1aa774ab4e30e023029bea49fc55b6121d SHA-256: 9b67b0ba546d83f726099e1230399074a2af27d67c7c0ba6bd9559a5c64a807c
196 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains heuristics indicating it's a link farm and a browser installation lure. The document body is heavily obfuscated, but the presence of embedded URLs and the 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggest a social engineering attack aimed at tricking the user into downloading and executing further malicious content, likely by masquerading as a necessary browser update or plugin.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/1d6c104f18737a7da9f9e0d47abcdb48/49218285821.pdf In PDF document text
    • https://ferdavagnar.is/images/fck/file/58434632223.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/87355868632.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/563c3d53df3ee811cbe9bba22f3f323e/gafej.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/81d796d0fd19cd21e5e24f824ceac1ed/87081857222.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/zezenewugenopogu.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/90c9bbe82d7fe0ccce17afc6cc2e8a0a/xezibelirirogav.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/8248b7e4266c1f11879bc9e7042ce484/74514806129.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf126f0566f---49611700555.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/fae6d7568a43d3c01d68898655935b51/ribulijogi.pdfIn PDF document text
    • http://stonebreaker.at/60896685429.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/nulinok.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/8943025405.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/17508913820.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/69579089388.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/biribe.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/zadebomujujozezeli.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609608dd50f15---golitusebigedulija.pdfIn PDF document text
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/46985123642.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/worutujudodivek.pdfIn PDF document text
    • http://www.pilartangguh.com/file/jolawadatugurudume.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/48122535716.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/9ce7bb5418249630e722c2b340644caa/fawigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+narrative+paradigmPDF 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_off000122e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E7 18620 bytes
SHA-256: c28e9ae1c7c9721a7bcfb36a8ee3f6747fa478b8f92e7873892af30c55d7a3a3
font_01_sfnt_off0001534b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1534B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B62 10732 bytes
SHA-256: 05f7ab40e099a65396e7518a16a422b190bf5ec01f5ff4ed4b31bc98b44a1e97

Open this report in the interactive analyzer, or submit your own file for analysis.