Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fdf507d17e0dbba…

MALICIOUS

PDF

72.1 KB Created: 2021-09-03 01:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ee8f7369bcfe77419545db7284f54f5e SHA-1: e20ae6bd3685210093c53ce025a4235c538c30ef SHA-256: 4fdf507d17e0dbba6540a4b986f9352727b5549c24009c20aedfa4c02b41c152
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm directing users to multiple external websites, many of which appear to be hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6691

Heuristics 5

  • 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.
  • 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 http://ohmytour.kr/FileData/ckfinder/files/20210801_00B3D9B83224BC34.pdf In PDF document text
    • https://cakenepal.com/userfiles/file/39304114546.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd58ce40d4---13343698315.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/a08dae3efa80e25a801bd059b422fb3b/86180107930.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/17761198795.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608145fdf3c8e---41158877279.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/21544388313.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/17aej7atf2oaqua8nfeaqicjum/50188429793.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/99917532503.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/vubelalapiril.pdfIn PDF document text
    • http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/46855325541.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a225be7920---vutujo.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5eea8c425---19013208442.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a1e4d9993---zupomasebukolataxuzebevix.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/ginifideseluda.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/13691598460.pdfIn PDF document text
    • https://topaldanang.com/uploads/image/files/wugirenupuwinimaj.pdfIn PDF document text
    • https://eubeer.vn/uploads/files/jokulavefigejexitabali.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/velatutubito.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/s7spn67rccghvqu5eaeegpt6r3/valitetaz.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/79675408064.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/26575061177.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/61ab4a2f76953c0b0db17a7967c99339/goritakogivup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=egmont+overture+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F1 19036 bytes
SHA-256: 02d03cc1ebfb28127951112fcb95be9542fa1dbb9e90db81110ccf186941076d

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