Malicious PDF — malware analysis report

Static analysis result for SHA-256 8212920133f2f4ef…

MALICIOUS

PDF

88.9 KB Created: 2021-09-17 18:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 9d42cef4b9b5ad5495a428e1d486a3d5 SHA-1: bc59e4986df1a13af2cbf66718573fc869f9d683 SHA-256: 8212920133f2f4ef18a31d1b1fdc33a638b8a06828fafbc14a22d82995371089
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, including one that appears to be a link farm designed to redirect users, and another hosted on a compromised CMS upload directory. The presence of these links suggests the PDF's primary purpose is to direct users to potentially harmful external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8695

Heuristics 6

  • 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 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://garglob.ru/uplcv?utm_term=mobile+legends+mod+apk+free+download PDF link annotation
    • http://varvshistoriska.com/file/64077485740.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/zerev.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/koxesife.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/46261943287.pdfIn PDF document text
    • http://epmachine.ru/d/files/gewavelaze.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/wanitujozupodezetapeko.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/duwex.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/79508019377.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/nikafevarupisit.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/jexema.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/170748babe2d30b30bb9921677cd96bb/39518915802.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161419b18ad3f5---rajidukonezegubekotivi.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/48580222271.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/zowager.pdfIn PDF document text
    • https://assofmt.org/ckfinder/userfiles/files/55407895172.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/fokutijowapilifirikope.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139f73a37d41---8751459923.pdfIn PDF document text
    • https://fasleh.net/Files/files/bowurosopadukinuve.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/2464585649.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/32482408002.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/leduwezafapezijiwujumuva.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/21880031798.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/79700739857.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613081a866ee5---25096530322.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/11080268549.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC57 22524 bytes
SHA-256: f97908bb1c6af39db46558a5317d9019a563ba13ff13912402d8184f0e8cd656
font_01_sfnt_off00011583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11583 16372 bytes
SHA-256: 3911bccfd68f22c1e71e191850710cb15c0f2f9007ec67f583c1e59508ee36e1
font_02_sfnt_off00012c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C08 11052 bytes
SHA-256: 85943d3405c6121722f5dd637bc14548f0ea2771114f44c05db618a6366c1851
font_03_sfnt_off00014558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1