Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f533269008737e…

MALICIOUS

PDF

76.5 KB Created: 2021-09-01 03:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 74579531372faa29ad82684c8199a504 SHA-1: 347da3d6a1d7d0c3431c2b82e7a4beda5dea7263 SHA-256: 18f533269008737eeba55938eeebf834ca956b21940155402eada8d371a4c4e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bcdbad20e---xixonefopasarasukur.pdf In PDF document text
    • https://vvpta-irvine.org/userfiles/file/75397705547.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9726f39c6c---11574680748.pdfIn PDF document text
    • http://tara77.com/clients/46590/File/96888030155.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/29440359767.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/c0b217b88a385f3691b310da4006526b/sogosatitavapukimigoga.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/zubotomisomusejuj.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/9jpl1adqj2seic4m6eq2vhg5j4/mezivizaguwuxe.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/84960933754.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/27997659241.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/xowemudetifibevulewoxiwe.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/fuxapuwikibizodujepamajiz.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/61038911696.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/bavibotuwex.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/dumojuzed.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/majovajipokiwuz.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc67724403---92874673297.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/mimibetivogirenewijunim.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/muzifow.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/lisapefamarewol.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/88358d4677bcc2e467199565142c49a9/65223122527.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/19479495808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=signs+of+oncoming+seizurePDF 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_off0000c87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE091 16664 bytes
SHA-256: 5ea0e2c8fe1fa5c5e18b87300039c210a2350702df5400224b0ad398cc50c5a2
font_02_sfnt_off00010b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9C 10608 bytes
SHA-256: 845171e67dc4f540950c54b473eb3117975dd4ebdc44c3b97f6a30945510d406

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