Malicious PDF — malware analysis report

Static analysis result for SHA-256 3618d0dd05ccd535…

MALICIOUS

PDF

90.9 KB Created: 2021-09-17 18:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a4cf7a77c24278b99ef92fb20203c89f SHA-1: c600082f59f647bfc8deef8f489c03eed9faccac SHA-256: 3618d0dd05ccd53504c3b1226e34411fd220ae88752e31f2bae83e8540ed58e5
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 embedded URLs pointing to various domains, some of which are identified as compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI indicators and the overall structure point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://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 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

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