Malicious PDF — malware analysis report

Static analysis result for SHA-256 14b258f4873390b4…

MALICIOUS

PDF

70.6 KB Created: 2021-09-17 16:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 816da1a933101b02a1535c2f4fb39e0b SHA-1: 3128eb6922abb7bc7a6c794c07c092d225ecdc96 SHA-256: 14b258f4873390b4d5d356ca7a14f24a4633d076b04617e0822ff69faffd4bd1
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. These links likely redirect to malicious content, as indicated by the ClamAV detection and ML classifier flagging this PDF as malicious. The presence of embedded JS suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6614

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=infinity+war+full+movie+free+online
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/de5d2acc8815eb769c7cdae00810b087/bekuta.pdf
    • https://brtim.com/uploads/wysiwyg/files/85594676834.pdf
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/bevumu.pdf
    • https://sarenpinler.com/calisma2/files/uploads/12603955075.pdf
    • https://bankkartya.hu/js/ckfinder/userfiles/files/61759124267.pdf
    • http://poaglasses.com/uploads/files/202109061325084147.pdf
    • https://nidi.mk/ckfinder/userfiles/files/wirig.pdf
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/tomavefogipetutet.pdf
    • http://leebyunghun.org/new/upload/board/files/ronod.pdf
    • http://zkqzl.com/uploadfile/file///2021091618533712.pdf
    • http://agriturismolescuderie.eu/userfiles/files/45084218732.pdf
    • https://mvmdigital.gr/files/files/8392649211.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/1ba240470755fd69dea6b6dca5b0d02b/xowexuvulozev.pdf
    • http://scarpatti.com/files/morusomiwubuvedok.pdf
    • http://carshopm.com/js/upload/files/nanevebudarujo.pdf
    • http://www.truca-taoules.com/ckfinder/userfiles/files/71002742977.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136121da8b97---48902441150.pdf
    • https://likeevent.it/writable/public/userfiles/file/32623031228.pdf
    • http://baovekhucongnghiep.com/upload/files/laxugo.pdf
    • http://nissanotogovap.vn/uploads/images/files/fezenabilosowewevavirogul.pdf
    • http://kartinatv.org/uploads/files/xajuxulul.pdf
    • http://cdkuysuujk.handysociality.com/upload/files/begezemunafakudobove.pdf
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/latisazidasipano.pdf
    • https://guijek.com/userfiles/file/59483440080.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed76.bin
843cb941ceda3222c93676c1420648790626e90c17ea09030b1b3829c0a0f038		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED76 18760 bytes

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