Malicious PDF — malware analysis report

Static analysis result for SHA-256 3147067078557ca6…

MALICIOUS

PDF

73.5 KB Created: 2021-09-24 18:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6708996eeb6311dc7781a66325cf27e6 SHA-1: 84bc4f8314373fa45367f1717ae9d86ce6f97c3c SHA-256: 3147067078557ca6f48b459df2980ce2afe5e98be6b863aee3a653ae4c38dd19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external URLs, many hosted on potentially disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. ClamAV detected this as a phishing trojan, and ML classifiers strongly agree. While no scripts were explicitly extracted, the nature of the URLs suggests a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://ketchas.ru/uplcv?utm_term=j120h+custom+rom PDF link annotation
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/92627989831.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/fuliluge.pdfIn PDF document text
    • http://portableandcool.com/files/files/bufosinegomip.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/b3f0a75e0f268acc5cb3f8582beb8aee/3522096899.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161471043f1d2a---wozovuzejalorawijow.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/munigabobaluratunuvag.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148cac0d1d5e---lebivefaxezo.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/3854439243.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/wimuti.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614442f891f14---vataxuzuribogofa.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613851871d73d---pipifilijas.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/17073091927.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210901_2EA3E94E5440CE7F.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/66612132860.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109192028147874.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/192bae2a63040c0fa091ab603fa7c24c/pategovavanifatas.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/nuxakagesuweni.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/3752716354.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/jogexiweweladukekaduru.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/14006915736.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161472739b2016---74702872872.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_off0000b630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE47 10344 bytes
SHA-256: eea9d42b9c00a78894187914989262359ade6db32d710d744604c8a6b13e5cc4
font_02_sfnt_off0000e5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C5 19828 bytes
SHA-256: ecb538ce9998d5164b48b2a8bf80681f5d2a1622165b82547a81da96b163da94

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