Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c0cc801ee288b0…

MALICIOUS

PDF

86.0 KB Created: 2021-06-27 18:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1cb12d0dbb19e65cb5cec6809112e484 SHA-1: 18b07c993f4e1bd976202fa8fec158f431ef48ba SHA-256: 62c0cc801ee288b0c495b2bcfa79786ccd937eea5b372ceef5c580927522133a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, many of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious or phishing sites, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=spider+with+pink+legs PDF link annotation
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c2023de869027acbcc668f036d1ac070/18832089039.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2141bc92e---42178859682.pdfIn PDF document text
    • https://abeess.com/userfiles/file/detujowag.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c02a866a9---jemudefekugowedipeg.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921e86dc2e8---68740403793.pdfIn PDF document text
    • https://topaldanang.com/uploads/image/files/bapedevegogegobisija.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/0kif74sdhol32idkk5d2ce9mbb/69356524591.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160869e2ae7662---46865610827.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/8526221858.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/dobajoxegefufaf.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/57249223675.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/57318661887.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/94104945227.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/651befc1e76ab6f08e5b2f916d13fcf9/sivagib.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc3b41374d---32893438961.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/12745bd0400e14764d659bf8abfdc390/foxarofaxudeler.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a6774d7fad0f610c28d7cfbb84403256/79256267887.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc78b70456---62374152897.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077828cc82cc---92256565509.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160773f6de6ec1---29515980329.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e487ff1fd2---tixofa.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/41627349122.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/3186229436.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/zumiw.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/81422989674.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_off0000f00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 10644 bytes
SHA-256: 0b95e4573e67889423c04ab3bcb4eed67606d01969cef2acbea6f415f158d103
font_01_sfnt_off00010826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10826 16380 bytes
SHA-256: bf3316c813040a1e101b650b0479a689023e6ebe9d46689a27a775a6fbf07594
font_02_sfnt_off0001329b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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