Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2ce2d1fb0a0037…

MALICIOUS

PDF

77.1 KB Created: 2021-09-01 12:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 3c391e4a6a5e5816cf0ea41b50937cc1 SHA-1: c3cf8761c2317c815ac71d67be7a3fd685b7ac75 SHA-256: 0a2ce2d1fb0a0037e22b1369ed74bb67b1d858a239cedb87a80e80fad155e328
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737beabe11e---20505489942.pdf In PDF document text
    • http://automsystem.com/UploadFile/file/20210821054245138.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074c6fc759a4---68202672433.pdfIn PDF document text
    • https://numberonerevolution.it/file/84591363553.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/e7283877a84f5bffa9dd25eda2716a1b/25199081674.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/68595137518.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/82712461925.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608486bb43712---48058591911.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/xifufekedapevixunadari.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4bbe1d632---kuparegupaxesidodenibo.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/vutuvofawesirozenufavugux.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/4ce1b88e726d7ee6c8ea18b54523c700/bagemiravixofi.pdfIn PDF document text
    • http://congtyvima.com/images/Download/wozipatapidal.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/gezebesupijafiduwi.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/31154924838.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c8ae308071f162ea8ed54938b88ecf44/49432494608.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083e09edd04d---pezedifilifuduxoxoxixosed.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/79160470534.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c98b30b9dc5---13833628273.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611158850bc3c---madusuje.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/71219604643.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088a6c7adb3f---27459079509.pdfIn PDF document text
    • http://armanetti.com/images/1841726099.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/35782438924.pdfIn PDF document text
    • http://cosmoscm.com/contents//files/7848709496.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=attend+verb+formsPDF 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_off0000cc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC03 10404 bytes
SHA-256: 4396cbefaf58de647a2b06860818a2fe53b791a3f41c3023981ae5c2dc327656
font_01_sfnt_off0000e397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE397 16640 bytes
SHA-256: 7c15a490d0f0c02ac8f5b2d6e169b87c0aa8a929940e7722543634da9df681e0
font_02_sfnt_off00010e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1