Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ccb727c21926c5…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 09:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f95e964bee0981e1cf2bb6cabd6888a0 SHA-1: 489d7017c33596c594e70c2e06ed180232908709 SHA-256: e1ccb727c21926c5d98d5e4b417b40a597ce3e26d1e67971e12d9aef28dde1c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to the overall phishing or malware distribution goal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://pixomot.ru/uplcv?utm_term=rizartrose+fisioterapia+pdf PDF link annotation
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b896490b425---82758077449.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/tonenagamevisapa.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/47372079335.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/jedesugo.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/94656817596.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/jefebisugu.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/75400729288.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/zamudunaga.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/97636558471.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075cd28cc121---kujidosavibazajivisego.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/vikugipatukejozopol.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/vetetogodupiturexibabudiw.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/zogujewaba.pdfIn PDF document text
    • http://ponderosaclassof1990.com/clients/d/d5/d5d19f6fc184e1fdd834fc62be9f1763/File/tufetikilexutupevoxarebad.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/fdc8b477babbd6e11e1a8d5799d72c31/61169227085.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f8114a06a54---kakexomox.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/luguti.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/81a56f10626d9ac96f4c076a231810ba/56343238390.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073e32bcec01---9288575696.pdfIn PDF document text
    • http://rsst77.ru/upload/files/19093902848.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/sevufepiberizos.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765b7ad9799---53869135630.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/75517428319.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/talomijazi.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/jorefogoxu.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/fja5cjrpvq4570ap5vl4cvc0b5/zokexetulozo.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/9c98b93b9ac2dc6456f754a413ca4db5/98760267007.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_off0000dfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 18668 bytes
SHA-256: 9934ff647538c61b5260963018c72b0f436cde9cacdd9d35ec45e3a8535c8404
font_02_sfnt_off00012852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12852 10448 bytes
SHA-256: ff40eaa3c5ae778f3b84603bcaba87c105879e1d81c7eb6fc7442b7b69ae6419

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