Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4495a99b9c9d5d…

MALICIOUS

PDF

75.8 KB Created: 2021-09-18 11:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 32df2d8980f8db3e39afbe2f45aafdc2 SHA-1: a197fb621988ed26425606451b8b5d1b73fed93b SHA-256: af4495a99b9c9d5dcbc4db3c06fa3ae605bf7a4766e98872695e69f72a05d23d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for malicious content or phishing lures. The presence of external URIs and the nature of the link farm suggest an attempt to direct users to potentially harmful content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b3cea988a---kiwariputuvaniguwifameb.pdf In PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/fe5j030c6tegsutpla036du4ma/tozugeki.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/23826777088.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/45807352498.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/18952759014.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/5dc5b216e20d8e6a37249cc1fad66d1a/vugagif.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/mafupimadegigemoda.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/koxiloginibewu.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/72129969889.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161451a5bbd697---51274572552.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/lagosa.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/24298358246.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139654e3aada---13725108098.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/86967657463.pdfIn PDF document text
    • http://npas.ru/pic/file/11077338927.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/fc9cb10c772ae9c643645b9b24a1151b/xafikokoregemuwekegep.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/53459381420.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/17263488876.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/kuxila.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/zinaj.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/25370151447.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/tapivo.pdfIn PDF document text
    • https://latework.cz/soubory/zatekiwekudolefa.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/puxavirolalitiromelam.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/36197614776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+remove+the+status+bar+in+androidPDF 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_off0000c2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AC 10852 bytes
SHA-256: ce05c8b6b7e303c133c93e103117dcd1a3667682bccf5858f4333c24d3157de0
font_01_sfnt_off0000db94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB94 17448 bytes
SHA-256: 9135514fe2f4ee881e7a5362870f752c6cdc8ad937f6502ac40d71c9d019cd23
font_02_sfnt_off00010913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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