Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c03c8d3e948cb8…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 11:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e2cf18de59a9230272a7afb1c8d9ff3b SHA-1: 46528c34a1d4066cf4c2d3cb89c63d8187c4e39c SHA-256: b8c03c8d3e948cb876ff1971a5d6459dfee1c30c41ebb2b77e341dddb6d3eb83
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://inwebjor.ru/uplcv?utm_term=cost+accounting+exam+questions+and+answers+pdf PDF link annotation
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/417678ec2d14b1af3ecd412dfd7e8887/66700873885.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16073750889f74---pixelofegesafefuta.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/10936839106.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/69fc86fd7fcc005d85467c9f839fc8d5/64186776568.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/43687235313.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/32468164678.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/15710980456.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/23980381352.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/c31b689eee91071ce15c081abe3b150d/jaxekukalawom.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a92ad13861f---48224245960.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/d90d1edb9e7ecc8280e0582d7cc1f687/54131796658.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/xobilugipofusa.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/tagenar.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/53362387357.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a498330a109---21245799142.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/13693043040.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/wemutunupuzisidos.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/2423960360.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/kozipijudobamodasoratoz.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/pinopuxozuwulavevak.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/31319589497.pdfIn PDF document text
    • http://mcelvain2020reunion.com/clients/b/b5/b5167212b805812c9439186484f80f5e/File/41400470295.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/dirotesebuzivenumutuxew.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_off0000d990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD990 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A2 17404 bytes
SHA-256: 25d815b016be6508dc1eb7a5d544bcf8317bc76feee300158d2f50889fb1afc3
font_02_sfnt_off00011ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBD 11380 bytes
SHA-256: 69c8e05796e5540b6dee91fe412ea0977fe8f4ab12b0f7ff6d6e94a089fc0cb2

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