Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e466c26a23f47e…

MALICIOUS

PDF

90.5 KB Created: 2021-07-06 08:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c76a3d22e9f7bcf507d2fab79b5da3a1 SHA-1: c76862e5725ccaa2612cd02630a41800bd2d0f88 SHA-256: 98e466c26a23f47ebf7ea9acca0c4e1c93038b48565728a06001ca89af8c10b0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to compromised CMS uploads and disposable hosting, likely to obscure the true destination. The document body, though heavily obfuscated, contains indicators of a callback phishing or tech-support scam, prompting users to call a number under a pretext of a billing or security issue. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789ff189468---76931153696.pdf In PDF document text
    • https://toskov-yordanov.com/userfiles/file/mevomunogineduwulut.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ded768b9f---28630754625.pdfIn PDF document text
    • http://dzbnf.com/upload/file///82099668090.pdfIn PDF document text
    • http://uci.ir/userfiles/file/zunafuzap.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5269721560---tirutuluxiwugeza.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1623482567.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607511ef8c49c---sotarakifapa.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/60759910562.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0e6be7525---xaxogu.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/siwemod.pdfIn PDF document text
    • http://stillwaterponies83.com/clients/74660/File/89752646596.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/pamusifawomodokofi.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/jajobijum.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/denedelosarozubazin.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/86493793553.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/38126d3b973f50dc94594209fd778b7d/36462982433.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/nakukekapumomasisuvijos.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/fawitusenolagat.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5969bc2ec---15291471107.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e0283c8a7b8---fejemineneraxi.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160961f600185b---6656987212.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/2e4098099ef81628919914f40895cbf9/kinewogamirusudesino.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/behq7b2lgngehnkg5kesu1jh47/jorujirekiv.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/nnr85orcmkhg1p3ed6q30qki4o/37221951815.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=best+sports+streaming+sites+firestickPDF 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_off0000fccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCD 10920 bytes
SHA-256: 12bc74dd0eef4226837cc9147d3c9253627cc7f4c01db91383341f2cf5569d80
font_01_sfnt_off0001162c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162C 17620 bytes
SHA-256: 251fe26a0905a91d1f2ed15c31bc69619ed80b1b98ec0cbcbd740a7c211e5c86
font_02_sfnt_off00014446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14446 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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