Malicious PDF — malware analysis report

Static analysis result for SHA-256 7564e807ab91a4f0…

MALICIOUS

PDF

89.4 KB Created: 2021-08-01 06:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e586bd6e48c4d471e25f636b8bcfd947 SHA-1: aaf65acebd0397b20d59a07351c955871044e905 SHA-256: 7564e807ab91a4f0f16ea5ec26a2f9bd122ee5eb1c1dc6c727f13ebe1c103bcd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/k9l4dahoeup42j96kagli9l4ib/94377412974.pdf In PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/66293506929.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/nelijesafitiduzevut.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086291c5aded---91011238304.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210701_5B4F787C92D9546C.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160acafc97a793---jizut.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/63786647090.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/vimegubagutemapemiwaso.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fe93900b6---suxinibonuxuxi.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/35716320291.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/lixegi.pdfIn PDF document text
    • https://teamcode.net/upload/files/wererema.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f058b3d5b4---zitadomitilirewixudam.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f49d1036a7---88545383322.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/15414765630.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/xefepufuguzepovudoxeviv.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/nudovebalemijavo.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949b7685248---benodizasap.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdb5489675---nobogifibotegodo.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/9261853435.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/wogerotizob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=best+place+to+find+shark+teeth+in+venice+floridaPDF 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_off0000f9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A3 10928 bytes
SHA-256: 4805c1ad4fff984aa335c9e8e3d188ff3cfdeda56db3d43e0e4a02b532c92d28
font_01_sfnt_off000112f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F0 17184 bytes
SHA-256: 2f4165f04c61c2047c443e0d43470de23d25f3dfabab8bfe42096c2e78079c94
font_02_sfnt_off00013f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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