Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc4a74706277fdd…

MALICIOUS

PDF

74.8 KB Created: 2021-09-02 15:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 43f8c57e6864d282e2884672f1391da9 SHA-1: b152758ee27c5f84d0a7cab8b370c0f6ff9aaa38 SHA-256: 4dc4a74706277fdd83a351ac79036e5b370d4e05be3f80724f2a8f83c2a860fc
124 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3916

Heuristics 5

  • 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
  • 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://roweryelectra.pl/app/webroot/uploads/file/16213604175413.pdf In PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612a363a4efe4---61999645127.pdfIn PDF document text
    • http://tara77.com/clients/46590/File/sunizedomidulusojip.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/75b9e60a909f619f04133207702dc324/85910864181.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/tojiliraboxozopij.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e1b4468cd8a---pogix.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021080805245347.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/mesabe.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/80679312993.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc092602d4b---5332896448.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/24962693465.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/tagapizasakif.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/9405351441b1d34a641b9c1052989648/35770592004.pdfIn PDF document text
    • http://howsonfamilyreunion.com/clients/5/57/57b8fe7d350e782a16e6afc8bdcd6467/File/76456647420.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/fokow.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fdc8aa42f---33809531993.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/supuvinewivefo.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/92460397335.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/38550563277.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/47939626610.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/kulelarekagovij.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/1330779670.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/af7248a4cbef664f52a82c0c302da769/pagopotajaxad.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/965dc8e4mac6sls0s161dgq7gv/sutomidejelufowasog.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/wibokukeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=verbs+in+english+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_off0000e50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD26 10504 bytes
SHA-256: 868c594138d445b855afe4d6adee5d524b43b293998c300f688101260d3a1404