Malicious PDF — malware analysis report

Static analysis result for SHA-256 403b62663945f382…

MALICIOUS

PDF

77.1 KB Created: 2021-09-05 23:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 055db5bcfdd4fc44c9ba17c6b28aef0c SHA-1: b25497f1ba9a1a484663f1ea6798352f10325281 SHA-256: 403b62663945f382828478b98633a32ade59afec25dafc5b3231a772e0666677
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous external URIs and link farms pointing to various domains, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://infrive.ru/uplcv?utm_term=column+chromatography+adsorption+and+partition+pdf PDF link annotation
    • http://www.deco-interieure.com/userfiles/file/95413105637.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/71792769734.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160869e5c4de32---nupipi.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/36689497347.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/1749875572.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/vuvifonorimiropav.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c68297b666---12343107870.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e5e832c869d---72656836065.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/paxufubuda.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bebcef41699---jozotitusokebexedoj.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/050550195491.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086c1a8291c5---96655347909.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/jawenogiselefexe.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076faf293fce---wubumolowelupafot.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/kawadupiv.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/vpjk9406ofcgnkpvrcl1c98sg8/sepubobubuwu.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774789c7943---64286255338.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/welanutisapagimuwexe.pdfIn PDF document text
    • http://liyangah.com/Upload/file/loperajowujimure.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/xakuxuxosipoponorujarum.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/21447102510.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/53574973333.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/gifewusunorovogaraba.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a6591d4f8d8---wokesoxif.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_off0000c8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D6 11180 bytes
SHA-256: d13b048fb3e75906a8166bd0fd31bc686b900630e209d7db23e4ec147eba7a9c
font_02_sfnt_off0000fa9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 16960 bytes
SHA-256: e135f1eee4fd3fa64e4e7c7e49c7ca1da5ce655c24f2f3f4b075f698e60f7657

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