Malicious PDF — malware analysis report

Static analysis result for SHA-256 161101f6dc5ea020…

MALICIOUS

PDF

75.3 KB Created: 2021-07-08 05:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bba3614437dbc34adf549460659332d1 SHA-1: 2fb10a36444a2c610a6b2faa2fd26dbbfebce78b SHA-256: 161101f6dc5ea020a3ff9991b21b6f37de8b6a5eca94d48441b6c3fd2772b9bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or to serve as a landing page for further exploitation. No scripts were extracted, but the primary attack vector appears to be the redirection to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://nomylo.ru/uplcv?utm_term=1911+single+stack+magazine+pouch PDF link annotation
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079be60bf343---jovefasafiravuxofasumufaz.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/kt455k8l85eujbsbrp0994pjvi/jolapiwinuzeg.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7376189513---buwonemojudupebux.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/5e5k5k4qnmkefn0uqeaq0lhjkm/19697093717.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/23e11237689159651cc4a31927c00db3/jelaxodolobuvij.pdfIn PDF document text
    • https://esz.jp/img/editor/files/fixosopiluluzodozilu.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/vorazalugugegobuv.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/24311087903.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba903c48c25---zuzorawekepajobugipuli.pdfIn PDF document text
    • http://bakoca.hu/files/file/rowilegixiziwasinovel.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99970386c---81032258012.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/58be00b2b69e366a42e4d44f798ce7ed/bamajabedigamukezeru.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb735a340dd---12195802507.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/9a4afae78e6297f8101ced6ffdf95ccd/guvubufesawovotugirope.pdfIn PDF document text
    • http://texmet.pl/userimages/file/zikokovojel.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///34401138504.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/fiwezisimilejamik.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1621911317.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f09bd6be8---fipubax.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/6f8f2b99164c282b637e33faffc451f6/pisasof.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e77a9efc43---34092065259.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/91604800512.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/pidiwidip.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/84609783908.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/a441ed84ed84284abd3ceb3c6b84146f/tejemobesuwefilekubikose.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/369d3a711c5e889b2211c156fa91ef20/lajajomonag.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC314 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2B 11096 bytes
SHA-256: 62a95b46394513339067dd35df7fb0ed7365d00cfc5d80f5b3d2434fc990f38f
font_02_sfnt_off0000f4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EB 16444 bytes
SHA-256: 656e8dac272caa6bdc7a4f191cdf576dbc5051f217d742df5e2a2c5e8efcc7ff

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