Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8820b90e857061…

MALICIOUS

PDF

73.4 KB Created: 2021-09-26 10:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 995506d8c774784f952bd6181aaeb8e6 SHA-1: 47fc3c03356789bf8521d91a002922617f5b098b SHA-256: 6c8820b90e8570614ce1ff4f4fe20f3b5769cedb5a94934d01a1274c97dc7368
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further payloads or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=messenger+hack+apk PDF link annotation
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/mrbu6s2ea9576ou18rdanb5a7j/lovaluravesadoma.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/86563512439.pdfIn PDF document text
    • http://eecca.stocker-development.com/uploads/ckfinder/files/sipudus.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/53286161856.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/dajelere.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/fidabepitasu.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161307895dbb72---23272456569.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/30110248264.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/kigeferuludukag.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131dd41bef43---ritutagixolurelunemitiwa.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/suvetop.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/11064353546.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/47207182624.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/42703356925.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/nuvikeped.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/70721731646.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/wemutedibowo.pdfIn PDF document text
    • http://espicycooking.com/files/file///68827966904.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/vemikidejikuvelilekapa.pdfIn PDF document text
    • http://art-ball.net/files/file/wosilatarul.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/72469658974.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/13214645886.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f315b951553d143442d499d36650518d/nanuxezokidotufinosifi.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/19219019898.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_off0000bae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FB 10380 bytes
SHA-256: 580046879d34e343dffd562d250b95c71d54f64bbbb2900604ff8df786e600d6
font_02_sfnt_off0000ea63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 17676 bytes
SHA-256: d6fd312215055b08c34c29c6b79a82ce1b04cd634c416aaef0158d853828de89

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