Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91a3367ba7e67ae…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 23:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 28e445abd540c63fdda0269e098a78c0 SHA-1: 5bfcae55d0c7bab8bae01774bb50e6f03b99e0c4 SHA-256: e91a3367ba7e67aee6433452a9fd122046f17fa61f38be7ed65f86bcb9daa9f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised websites, many of which host other PDF files. This suggests the document is part of a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/13btb0el8u7fi3btjjj3e1j0n3/lalaruxejuborakexe.pdf In PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d114b8e75---newubogosagabebekone.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/12919032577.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af176b2c6db---wuwufi.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/jafutiwajemezi.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af08ddb342d---41716040639.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d8f183102---juxogal.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/ffe0a3f23207b76ecb7f8810099435fe/7652233270.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/julajirewujazunifij.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/novaxizujedozukunopeko.pdfIn PDF document text
    • http://ridendo.cz/files/file/17149050045.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/9d130e7e366d5dbff38177dc8123fbb3/xuposajolisuniwifukir.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/bagepasipimi.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/toxuketupugewizegufe.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/71013604467.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc339d455e---48926323267.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613269b4e4046---60163643411.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/d9dd9f7ako06g87ji7alb35bab/70258920137.pdfIn PDF document text
    • https://efnnma.org/files/file/26143184728.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/wegamojavakol.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/f2115467e9d2ee3b496d32856ec376f6/48543391912.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/89524995434.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/44313051569.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/e431e04c4c05cc4a296aebbcdea57b6a/gaxuwasoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=glucemia+postprandial+pdfPDF 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_off0000e063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE063 17916 bytes
SHA-256: e8888873bac1873b66281048408661802ef49f3f7b68d1c7d9dacf9e58ec2ab4
font_01_sfnt_off00010ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12708 10920 bytes
SHA-256: fe0dd0b9687b3c6571ac788c05861d0f8719198305e09ee2ff79b5d3425c2135

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