Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a7faec701142b0…

MALICIOUS

PDF

81.7 KB Created: 2021-09-03 15:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 735f5165992c9ba72e344b0ded010e6b SHA-1: 65525cfaffd3503128eb27f70fbb214a9d92349c SHA-256: f1a7faec701142b0d36cdf8ed2ea1c0c9d293e12710e40c6cd0aae1923ae8a98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://soudurelausiere.ca/upload/editor/file/sotoxoturiseraxituzuz.pdf In PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/knqb0jt7q42tnntqn4mk37m092/70494142572.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/wabefuzap.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/79173781935.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/23642480165.pdfIn PDF document text
    • http://dnepropress.net/files/file/53944673432.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/78580975204.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///94306185294.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/21099021883.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/b5b48537f4cb903468071994b542e64a/10522039333.pdfIn PDF document text
    • https://people11people.gr/uploads/File/81320750509.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/60335873584.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/jizavirojebixelok.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/36428770069.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/44b849bntt9k71699h9judip3j/gadizaxepasigufe.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/20893700486.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/pukajekaju.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210818193435.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/676bf91d8252ffbaa8e0a57005dddef3/16598521739.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086daac886ca---loxisunibez.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/81445015142.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16084f504ad573---nosefuvuxawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=iktara+lyrics+pdf+downloadPDF 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_off0000d95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF173 10724 bytes
SHA-256: 0d0f5376f607ba71026f59b40b79f60ec67120ae34908ffa3f06280dcf2f6436
font_02_sfnt_off00010a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A46 17912 bytes
SHA-256: b8c7298dc70c044bfd1410cfb4496e1247dd0058e920fd106320986bdd2afedc

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