Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f7c2ad7af88327f…

MALICIOUS

PDF

79.8 KB Created: 2021-09-04 18:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2197952bb266596b3c31b8300314305a SHA-1: 43d34342cee120ea49d6344469bf29e399314dd5 SHA-256: 6f7c2ad7af88327fcdf5302bd8a166bbb46b4b0e15a1cb49f54450e4173ef4ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised or disposable hosting sites, indicating a link farm or redirection scheme. Heuristics suggest it's a link farm on disposable hosting and that it may be a phishing or trojan delivery mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.asiacoservice.com/file/files/80579747400.pdf In PDF document text
    • http://slp70.com/clients/873855/File/4413578069.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/sibiwogadaned.pdfIn PDF document text
    • https://lecachet.fr/docs/files/36038599143.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c856f90fabf---xugugo.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160859f775ae1e---97943143582.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/98751723095.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/lajalonirovinidugowuta.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/gadixipowiz.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9aeacaba2---figakuzu.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095a1b0de9d9---69414428459.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/lowixop.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/50589534667.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/55203792429.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/58c8227f38b9976348c0879ecd89a1d9/jufovuxifokapizazet.pdfIn PDF document text
    • http://airlineclassof66reunion.com/clients/c/cb/cb51827d251551eca15067b3b23580a4/File/bibekidut.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/mosupudoro.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/53867710410.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/89234635313.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/97484f12005a8482de52827d57055734/69197371463.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/979d3d8eb5dc8d54873f30c4aea62ad6/vuwagufu.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/cd7038415c693897905e4dfb04c112dd/71073203383.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e2211a5c9172f87ab294e08fafa55da0/71248426532.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/vosoruxebaxositarokorawu.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609866a04d3b1---nepisevodazine.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/f9926973950846d178f8fc4e7a16c652/88758878913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=formal+informal+and+non+formal+education+pdfPDF 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_off0000da15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF227 15180 bytes
SHA-256: 75c87c2426a9a5812369fe81812fd02c3b61cbd924e00254c2093697a623b37a
font_02_sfnt_off000118ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AD 10688 bytes
SHA-256: 595da52faad86656a05583e8d95a2301739947c4b9d2a6ef22893181c574a393

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