Malicious PDF — malware analysis report

Static analysis result for SHA-256 27143cbb8a013dab…

MALICIOUS

PDF

75.8 KB Created: 2021-09-12 05:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9cd99c579aeadc22e116aadca8bd13af SHA-1: cf06d494cd44bd6fd955ba483dd4df7d56a50d84 SHA-256: 27143cbb8a013dab529a1bf4792f9db776f2b42c338db52f2e45688b6ab42670
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The primary intent appears to be redirecting users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • 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://laborke.ru/uplcv?utm_term=top+sites+to+download+tv+series PDF link annotation
    • https://tivirtual.com/userfiles/file/64994271772.pdfIn PDF document text
    • http://djapm.com/userfiles/file/34751168520.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/95914266393.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/14138409979.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/dopetaluzedunivov.pdfIn PDF document text
    • http://www.toptehnik.si/images/40600001366.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161324c451d693---wujiweza.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/36e7f4127a54c9822ef232619c44e1d1/givesobagafanalitimoka.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ee3fcb868---nuwek.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613677c629078---mofevob.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/78232891424.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/c42b6df99fd3e515bc82e8798a401aed/jususesimasoteka.pdfIn PDF document text
    • http://njboyuanchem.com/upload/files/wasuzanudamugejevilep.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/ritivivekipije.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/36992546548.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/89567298442.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/30d46f59f531e90b4b2e6297ec1382d1/dipizomumelewutinatoto.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/67268482319.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/53995017852.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/dizefibuwujudekumodeputa.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/mitosor.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613112fa871a7---pugulu.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/tuviloputewujuw.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/sosavatifozijoligusuj.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_off0000c508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC508 17156 bytes
SHA-256: 8e04435f61104f6baa0ff6c704fbb60f6ed0c9da3339f0fabe6d20be23a7d6d3
font_01_sfnt_off0000f19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B1 10500 bytes
SHA-256: ed832a558babfde72274461eb40c35212225c66515cb9c0e0b5a09440284429f

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