Malicious PDF — malware analysis report

Static analysis result for SHA-256 af42e811322f7f96…

MALICIOUS

PDF

80.5 KB Created: 2021-08-01 05:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: f49e51979f8e0f89a2559ac37176816a SHA-1: 239a9cceb82392c3a7023858df0efa6f0c4c76d5 SHA-256: af42e811322f7f96921ed7725bd42ea674cfb0160f03865ec70fc5466b7119f5
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 0.8172

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://alrashed-alsaleh.com/userfiles/files/1965843508.pdf In PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b301962d4---91153663289.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/66a2b6b3f780f0ff53a282d967c2564c/derujusopanowowokipi.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/92326220147.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/86031698430.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/51768071836.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c26b2d1f9e1---90011944329.pdfIn PDF document text
    • http://hrudolf.com/userfiles/85773956868.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b592c48ab26---jamopexulexofovu.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/mumuzibidatatag.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/lnjmena5b3ccsamkg6gi76g3af/felej.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/93844848569.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16103c9fe886be---tababobidumuwu.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/supukenedoxijata.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076440800797---15915012224.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/7q6mc5fsl0ve1grm9qat91jnbp/26836082856.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/85816613907.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/v55ic5qhqkh1g0trul90uvoud0/butaputeliretilov.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/gugamexowuzemazobu.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae52475aeaa---87267863438.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160764513956a0---xudavibidugemunovevi.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd21a9d560---dakalikabolinagubude.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4435952e4---pubiwedivonim.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/vesidiligutuzij.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/fe1f0cb4e0d5a7671a5d2995fa5b9c04/62990622248.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210626033802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=harman+kardon+avr+7200+specsPDF link annotation
    • 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_off0000e81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81A 14408 bytes
SHA-256: 8294278ab963ac5382b034c72ce7ea0c6ab058cd246746bb201a50f3cdf8a0fa
font_01_sfnt_off00010c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001243e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243E 10880 bytes
SHA-256: 251ed03813998b72e0d0256e5d9a43ac31892eae814bcee6ebf815a1029cdb49

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