Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62fd419bbc37bfa…

MALICIOUS

PDF

86.4 KB Created: 2021-07-31 13:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c374ecbdd3eb24a5246dd58cc7d9e5ef SHA-1: 7d082b3af96354b0cc17fa5b4d2d32d841a9ab0a SHA-256: a62fd419bbc37bfa69d1e91503955cb0be3ebe9bca01943b92b13ddf8cc5ad0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/1dpae9u1aqnbfu30ic1plplv45/47192899533.pdf In PDF document text
    • https://viettrungson.com/media//Files/89781327910.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/27n23t5khh05t9a59l4amldsht/bagaregagikabagifok.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/fidozuramixiga.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/54930421593.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/8fe76ec54e31823c5cfac389f979611a/pebaratulajewololijuviv.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lumegasisalet.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/4530414961.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075c87e283ec---kaxozavajomabumedakaxot.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/xelakutuxarevu.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/rejezesabix.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/68990530642.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/12276224394.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/08150bc96701346b6490f5ff093a698a/zidatowisolojemekuj.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/gazajajasepeditopeba.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/5918980a2e535d2539380df6d7cd4249/34339043460.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/0otb8ft3d6i8fp4fntp66ufj2d/32442103333.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/50818068703.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/19532579716.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/59215407053.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/gler05h3egjuaa4klg0kfp4o59/dopegika.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/48286082874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=salary+increase+template+ukPDF 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_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 16552 bytes
SHA-256: 65790aaf73f5d6b4c9f410fdc9d1e58ea9aa6a64536e404b1b171999fac7478e
font_01_sfnt_off00011972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11972 10796 bytes
SHA-256: b8f8ab711c09b0e9850855d27a7e42c0bc1792b8e005485d9fde41214ca21c33
font_02_sfnt_off0001324d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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