Malicious PDF — malware analysis report

Static analysis result for SHA-256 c802164a1f97eb5f…

MALICIOUS

PDF

89.7 KB Created: 2021-07-04 14:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94e4c9773b88b387f2b4c43ae2c9ce7e SHA-1: 99645955b0ddab3f067ae2a339c9eb3a5a8ffa6a SHA-256: c802164a1f97eb5f6219d4c4167e5ae2f05d056f8babc887dacae72ae7455cb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that may leverage embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://synerhu.ru/uplcv?utm_term=types+of+natural+cloning
    • http://blueyee.com/upload/file/301546362444.pdf
    • http://busankid.com/webfiles/board/file///83575636304.pdf
    • http://mispuntossaga.com/campannas/file/jazenagediwupesuwakuvuj.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775a522bce7---95703512415.pdf
    • http://akwarella.pl/user_uploads/file/fujiduzimiguzomujawe.pdf
    • http://nickels.design/ckfinder/userfiles/files/ginixugevokofo.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/4r27qfilstan5f0h9ticv53u98/penogowigosajimovusenu.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094d91079ae1---10647144744.pdf
    • http://seoulsquare.com/userfiles/file/fadatilorokisanaw.pdf
    • http://jorakaygame.com/ckfinder/userfiles/files/lawupurovelopenixeloro.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/46ac7a2fff3fdb3137cea5225e644619/68064179092.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cfac3d1b091---jekuzugamonunawe.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/b5cb0b644df251c6ffd3470b5933335f/51363560467.pdf
    • http://dermaktif.com/imgup/file/jawikidap.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/iutlgkr1diqgmseu29do5v31ch/76984922849.pdf
    • https://aartipalette.com/userfiles/file/35175313229.pdf
    • http://wsp.pl/userfiles/file/7732060498.pdf
    • https://feng-shuiworld.com/userfiles/file/41816008506.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3e720e64---13687659128.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d36e1bafb---69906544718.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/bu49ql32080q8f05o8osk3nvas/winorabiwitovigelu.pdf
    • https://pharma-tools.eu/galeria/file/xiponavid.pdf
    • https://syntellect.ru/Repository/file/mumetakezelaxixomojedegev.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f0d59627e---gixajeratase.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3b445cc7e---mokegesumifa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fafe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFE 16792 bytes
font_01_sfnt_off00011315.bin
269ce4e0049d80f1ff07bd5253c919e3442f3eca2eed222cdf52be8411fe5d0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11315 10832 bytes
font_02_sfnt_off00012c44.bin
bd5a02e4822be55a187f6e2cdd48e00a098da81ef8f997cfbd700127b261a99b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C44 17708 bytes