Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b76bc6863dbd48…

MALICIOUS

PDF

86.6 KB Created: 2021-09-08 02:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 13867c1a21bc889d54ba4ad6d018026d SHA-1: cd6accb65cdff1824a6791312a6a14a9fa57f555 SHA-256: b9b76bc6863dbd48d9790fa5f2cbc87da7b35fc0a5be4edcabd0498e81111d52
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads. The embedded JavaScript likely facilitates malicious actions, such as downloading further payloads or redirecting the user. The link farm structure suggests an attempt to obscure the final destination and potentially leverage SEO poisoning or compromised sites for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=avalon+vt+737+service+manual PDF link annotation
    • https://lolakarimova.uz/ckfinder/userfiles/files/67994168900.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/pizisasekadasedubisofut.pdfIn PDF document text
    • https://miet.hu/kepek/pugamu.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/f06a230804b4ab600a0da379033a0421/xetovepotipakolaki.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dde821eb50c---43031892862.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/raposigikibe.pdfIn PDF document text
    • http://balone.net/_upload/file///99768915248.pdfIn PDF document text
    • http://webursitet.org/Files/file/71779242688.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/lekakone.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079eedcf4014---51585671037.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/bubalelilubulimonevipido.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c62e878f7---30849315544.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/98576706784.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/zumalinemidoziwesijo.pdfIn PDF document text
    • http://alkanboya.com/files/file///1624767806.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/sokuruderewinexatunek.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/9973667683.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/31725180588.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d977e379f8---dezatowukilupiranuroxaje.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/jenuraziposigonebadikine.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/12723397360.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/rezokapiva.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/c6bc8a27c5fe528cf2d471bc9ce97b0c/23117967477.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed7917bec7---xuwifizoridalogavosimaxu.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/wezozizulaxuvugedakimegad.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_off0000e748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE748 19828 bytes
SHA-256: cad27bfaabd759b44f4444e3bdf415b8cda59e1e1ea7d5baa8ab40967ca0b783
font_01_sfnt_off00011a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13276 10760 bytes
SHA-256: f23742da5c8040e544e91c7d703b909864fd9f3490735796274ca938dad4e68a

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