Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae51c7840511632d…

MALICIOUS

PDF

84.5 KB Created: 2021-06-28 21:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c1922329caaf6aee0ccdaefba8abc3e SHA-1: 157105eea2fd7643da836dbf6e6fae68b870ed41 SHA-256: ae51c7840511632d2ee18f920172b42d98f986f632eb19c408a58f7b8ce7d285
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://catamma.ru/uplcv?utm_term=how+to+make+pillars+in+terraria
    • https://biocoils.com/img/file/61481283770.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/54ii9jfcpimsaq71ad2jak3oal/remakor.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b831c98bb---7701568176.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f8f6048ee7ed3f8f684c4fcb29f45864/pulawasafinipi.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e27b673e68---79166366299.pdf
    • http://fotografiafrancescosomma.com/userfiles/files/55408958786.pdf
    • http://chipublichouse.com/ckfinder/userfiles/files/69676009856.pdf
    • http://thaiboxes.com/piceditor/file/80739365243.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16082f17d0b261---41508108046.pdf
    • https://masini-de-ambalat.ro/images/userfiles/vaviw.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606db377b8ed1---29290011095.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160887255a3ce1---munilaxewutabibofapilu.pdf
    • http://electrogalicia.com/electrogalicia/recursos/archivos/zasikigilunet.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096140606eed---rutadelijutipaxogasuxo.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea73dec204---12035422133.pdf
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/48d76e2689f295fbdae22b28c70a0ac6/pulukaxutev.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/70babb96b54893746dc300ceb99dc583/jitotelemako.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4dd.bin
dfc5dfe30d0d05c0fd2537ad12f1c28bd342a77fdbe0a71e0c325ba697f75680		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DD 10584 bytes
font_01_sfnt_off0000fcfe.bin
ba1452669f7b4b38aa24632fb1178ae326e9568ea6dc657f0257687a1d2d3b61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFE 18872 bytes
font_02_sfnt_off00012d78.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D78 16792 bytes

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