Malicious PDF — malware analysis report

Static analysis result for SHA-256 055eba97be50bae4…

MALICIOUS

PDF

70.9 KB Created: 2021-09-06 00:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c434792fafce5e1ecbf1cbdad01c4001 SHA-1: efd6c759942f976ac23df6dcf9c250ef05073e1a SHA-256: 055eba97be50bae4a8140b7a3474d59f41bb6d25bc213838f1080999f810d4d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV heuristic strongly indicate malicious intent, likely phishing or malware delivery. The file's structure as a link farm suggests it's designed to redirect users to malicious sites, potentially exploiting vulnerabilities or luring them into providing credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=interpreting+graphics+worksheet+answers+biology PDF link annotation
    • http://solarexperten.ch/fckeditor/editor/images/file/73831326680.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/samosetidusukuxisozoges.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070390183903---fenuvubudupepenupewita.pdfIn PDF document text
    • http://slsnn.ru/content/files/65926539130.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/37321747459.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/f2658d0ca91cb50ec23722e7255d5705/zezusetokefegolavelala.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/94777695004.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16081c20b5ca61---tupagupobefivoj.pdfIn PDF document text
    • http://www.moyekolodin.com/files/32450160286.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210722_FA630D65BBF63099.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/24159048761.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/laxarebezotosedas.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607200428ad26---najetug.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/wiwoteba.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ossicik8blfkdef8as1paro0jd/nelejokofiwosokedagimila.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ae28abb99f8---98216980697.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/mepedokofedibiburiwazekud.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/18031493036.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/ralajipurepijatetuvani.pdfIn PDF document text
    • https://mbbs.hr/files/kabekukulaxurebosuzaramed.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/65316895711.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/vabuwura.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/mapukajemipiranurukitafop.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_off0000b4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C5 15500 bytes
SHA-256: bb38396d554e9fb6c152181925867226f7678a0d277e21a0b2ab0b1e1ff5ba9e
font_01_sfnt_off0000dc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B5 11036 bytes
SHA-256: efabba2c246f695707465be5f092aba22b41be9461c14e2bfb8abb1bb22f03e7

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