Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a66906aa6c3d9a…

MALICIOUS

PDF

86.1 KB Created: 2021-07-20 11:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e96aea1dc272a9615bf61ba7176bb39a SHA-1: 9fbe3f7247b7090abdfa7e9d52c3ecc1fd37faeb SHA-256: 98a66906aa6c3d9ab4d86dc25f8402aa6b6556e9bae8f45d2cae4e39dfbf3130
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous compromised CMS upload storage locations and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://adaviestransportltd.com/userfiles/file/zomekebogifegoda.pdf In PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f587b922---1778457446.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b782c837a4c---woxabeniw.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/zoruduludikedesu.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/6450400781.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/fititikusijelizodoguv.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/39619231005.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/60562140033.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a26dba3d98b---71710365687.pdfIn PDF document text
    • https://buka.ru/sadm_files/62439843043.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/93ed88ed7e0512ed97baeb657be66c3e/24117032947.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/59831317409.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/71023957318.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/mefagopesave.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc0629c763---danuzezan.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609926cacf8d0---93830803959.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/46097761729.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/o2e51avd8miv42dt22cmj822cj/39993754381.pdfIn PDF document text
    • http://cosmickino.ru/sadm_files/jukora.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/5413d2ba011b77631ce58aa31ae9fa4e/dogoxofiduwivomakonak.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bbbd3cb3a---vuvovuzogudigiwo.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/95713331885.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/96289341584.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fcc44191b---xawiduveleg.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/zojorebuvofenexopivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=reported+speech+for+beginnersPDF 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_off0000ed10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED10 17620 bytes
SHA-256: 2b5fd645e7a6d3d66c87587bd3356b2f56770f3d0acc10325520fa5bb2fc7551
font_01_sfnt_off00011a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13255 10876 bytes
SHA-256: 2dc2a1bc2fd7b11068e85c4c50c232712ae9d48a0d14624888a263474d142c31

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