Malicious PDF — malware analysis report

Static analysis result for SHA-256 474697c851acb733…

MALICIOUS

PDF

85.5 KB Created: 2021-09-16 20:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5190cd7f7920710aacf7b56ab2f4f552 SHA-1: 215b6398e611545c94c75fe44f730c91146051f5 SHA-256: 474697c851acb733ca1705f7029f0033dcd6081bd5b63c223f3083d95872a9da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://medvor.ru/uplcv?utm_term=android+url+scheme+open+app PDF link annotation
    • https://sunrise-photon.com/upfiles/editor/files/gudikufujivowapijalixaso.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0a60491aed655badf4afaba0ef1a2ab/fosuzi.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/telekhdj3j2d0d2p18a8kf2fvb/15037216907.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/10424094655.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/tomurideguwoligoxixo.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/10268169919.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140290672694---66046002292.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16135138f1b9df---sogawogapufepamopedulip.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/tatibidur.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/79370584430.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d90d75394f46333594372df97614ce4f/vatulixew.pdfIn PDF document text
    • https://duel.pl/userfiles/file/25044755451.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/wululudokedorilokigemaki.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/folirobofidoteki.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/89745070023.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/16956197004.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/87155530403.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ec2ne6kt3ongu3jpuds8d62u0v/dogizepolun.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/vodebabepujusewogiler.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/divirulojowidifofe.pdfIn PDF document text
    • http://prompol.com/media/file/mekezisetagiz.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/rovokizivokinilek.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/benakefiwepadajivoraboves.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_off0000e985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE985 18140 bytes
SHA-256: b46d0431c5c103db5481ccc989ad1c383f5f3fd0fa5b6b870a086e4db4061e4d
font_01_sfnt_off00011783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11783 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9A 10760 bytes
SHA-256: 19affbc94dd7cdce11b2afa753bf6459ea28b334c4c6d1d1889128a83e0d423f

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