Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f089b917a50ab8…

MALICIOUS

PDF

79.0 KB Created: 2021-07-06 21:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 0a4a193d8b0342a9776a94bdef1628aa SHA-1: e6ea749a84e1f62ed1916bc88c3cec89bef88cb9 SHA-256: a7f089b917a50ab8e86a103127ba09aef7399a5f58c62b39e9e41c757cc49445
162 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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5739

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.
  • 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
  • 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://bititechnika.com/uploads/file/vikakudoje.pdf In PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/e7b7c8ca11a4e00373d18bb405ff3fa3/fanuxazixedupajotugutuku.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/8068cc55f722bee45cc41fb4b6f4badd/jawiwezixitet.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607b465381e4d---95301599087.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe1cabedf7---sabobufogetig.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a965884e200---jipupezeditarebipujesolen.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/e94c9e02046abd6055733eba665a24ee/lirejukagapej.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/71bf04e659d5a55f65009836bbe27e16/jidexulufasevidisazij.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/6506ec736722b9645ecbc1b0ad6185de/xudogukewatoresawami.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/e5c09c3f5d5eac7b26f1fb272eebe4f2/27948367321.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608380389b318---sesanowawov.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/bunosewuwaxiwuvekofisapoj.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/tahcs1cvkre7mr9rv6i5a4kpc7/51394328513.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/342j45f4csul41ro44epiaosv1/vopepobikifugodinaligabi.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/424lll5bqjhfpci1l065vkiud7/87604878343.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/d6720rn2suulc5d591nkj2ue92/29826070238.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/58489157792.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/24340066992.pdfIn PDF document text
    • http://canadanur.com/resimler/files/61210705024.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16070e95f95fc1---32297126950.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/zotapi.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/54228252362.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bb3e52eba---81150963098.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fea7d47e4---91765594584.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/46669724538.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/61453302602.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/87517859279.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160709cde76bdf---20456887186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cours+microbiologie+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DA 10868 bytes
SHA-256: feb3ab46ff1397ad084c4f47e114466fbf1436767f302c5789ea00e3191a6b74
font_01_sfnt_off0001118c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118C 19528 bytes
SHA-256: dad9307e9e7780f544bbbe1b2928886b738eabe1cc0d09ccdfe8141ede7f6989

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