Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b4e4984823b0f5…

MALICIOUS

PDF

88.3 KB Created: 2021-09-05 05:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6732842bfd5c105100bcc7508c7b1a3b SHA-1: 0b358007dfecb885b3a3e54ceedd1819a9dea39f SHA-256: f8b4e4984823b0f536012932d1898b02bc13c3c4c43e439dd227fcac3dc6d20a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to lure users or improve search engine rankings for malicious content. No scripts were extracted, but the presence of external links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://414movement.com/wp-content/plugins/super-forms/uploads/php/files/895afd912df5025aef0ba8b773e950e1/gobigubelobavokelenif.pdf In PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/raguxibujifiwi.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/j93dnv7erq4g8uca1n3sdm76b4/16959663736.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/86192475391.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/kurijupeg.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/basojipoketosopowaxujajeg.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/risegomekajikeki.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/06800bd60a19272a0f0cd90e6750d6d1/pufikap.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/gumazuxopetisotupijedexan.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/2848035820.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/42483383872.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/jtd3d22e63919pb8r7muc66ge9/1300560956.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/tavenakidafokoj.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/xojurora.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090398200204---refewonivijulikovuxugak.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/78281661616.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/5257208099.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5105b26c5---nutovejigemefezofadewex.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/6969770737.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/71354709742.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/78765ea19b32c2a0c55dacce6b43a5a4/80451475630.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5c24c5fe03e1b35e29a9eb78a96bcc61/bevifovofanulizajodaj.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721f0672985---82769801856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=kangertech+subox+mini+instruction+manualPDF 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_off0000f1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C6 11008 bytes
SHA-256: ecfce0d35a4c8fe29d0519e83df54fa8b8cf8b4b0b98e1082f6e016f41af1073
font_01_sfnt_off00010b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2D 18656 bytes
SHA-256: 634a719ea41c68ddd877e249b9ba4bd133050b3e6b63f885f5ef4992a3987fc9
font_02_sfnt_off00013bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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