Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e2edb2c4f4ffed6…

MALICIOUS

PDF

88.8 KB Created: 2021-07-06 11:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fe2c3e6af6eeb605e9fb583c4d01fa86 SHA-1: 938a8ddc0d551e18ea21f0f540867efb4aa3ac38 SHA-256: 6e2edb2c4f4ffed606d952a1b177b74f867c3b2a9242db7345a9101753ae69e6
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document exhibits multiple indicators of malicious intent, including a high ML score and ClamAV detection as a phishing trojan. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content. The presence of a 'Browser extension / update installation lure' heuristic indicates the document likely prompts the user to install something harmful, which is a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=oxps+document+viewer PDF link annotation
    • http://tfh-filter.hu/_user/file/98946483813.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/tuwibowopi.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/ecefed5c23a2e71c5670aa9bdf285332/24765790403.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/30481587919.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/44707486658.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/nemaxu.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c12e16cd411---julebegotafimiborulogataz.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/23805120412.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160acf52944695---ginifubebukasowim.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/dosuvilare.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/rirenusawodo.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/10445826495.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/rosedarenipagu.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b733fe7ad93---kigezazebof.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/radesiwoxupalumes.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/verazaxadomosawegabom.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fde76e13bf77a6691ed3cc5624796360/60815612778.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/lugizujoderazelanokizaxa.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/97956705680.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021050305515868.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aea78ce0f10---74191289205.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/0e85c117470d28e53de82f1bcf73db62/57240286731.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_off0000f6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DC 17616 bytes
SHA-256: 475ef48aebb63a578c88344a37ffea7c2fd31939c4bc783bfd73efa2b9c8a95c
font_01_sfnt_off00012500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D17 10848 bytes
SHA-256: 54afc916632ca1e4c778621cdc6d252e65fe1572853be925afb9e4c5bc5cb0af

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