Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f479dfc241170ff…

MALICIOUS

PDF

82.9 KB Created: 2021-09-02 18:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d59148817787e12d81ddc31f5ba30fa0 SHA-1: 84c55e55ccec7f2ba404769686dc22a742c5498f SHA-256: 3f479dfc241170ff90a06276db9565dfd49c428864d021a138d606a72ed2a81b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, directing users to numerous external URLs, many hosted on compromised or disposable domains. The ML classifier strongly indicated maliciousness, and the presence of multiple PDF link farm indicators suggests an attempt to distribute malicious content or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://apricomm.com/userData/board/file/xojafoxisazumotolaxakexu.pdf In PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747db651a02---19797816155.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/kuxedatisefaratoronakobu.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec63da18a3---44472595588.pdfIn PDF document text
    • http://ihdbd.org/upload/files/80296588013.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/41391014653.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/bimat.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117f8e6a4d14---94308628937.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/kudivinaradejedeteloviw.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/14988227441.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/kis967jjim3mt4vorr9ejgfglh/fizata.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/vosekebusajogod.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/3ml0iac7n8fhf1bp0pi5t16ln5/tanozuwavedetumorexupe.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/xesajokabix.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d5354322a---tugexofoji.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d71ae3e640e---26824948000.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160782333318f0---40627282202.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210702_B595C556AD3622BA.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6bc2523ba---92189228410.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/11394181157.pdfIn PDF document text
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/vojut.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/73568695089.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1612aaa9d164c4---43038004827.pdfIn PDF document text
    • http://abworder.com/uploads/files/fizexigiligowelebutav.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/9ff6783d8a190e5136de274838d6e7af/18085399714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=klipsch+subwoofer+8+manualPDF link annotation
    • 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_off0000dcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EB 18144 bytes
SHA-256: e7bbbf2bc32ccd8fe3686f168076beeda518888b7c93e9ba16a755c2147e28b0
font_02_sfnt_off00012467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12467 11172 bytes
SHA-256: a3bbd45eeab82d03915c191a020ff58431b96808a03a81f8601724fe34e91f02

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