Malicious PDF — malware analysis report

Static analysis result for SHA-256 4440524e06bdb2b5…

MALICIOUS

PDF

80.0 KB Created: 2021-09-04 10:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 014f01565429340598ac6bb72c39490e SHA-1: cf459a3f963b6984bd3c56382bcd529da7bdaf38 SHA-256: 4440524e06bdb2b544cdc4e324b0dcc78dbd6ea030e4296720e78ed4716678e2
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed multiple heuristics indicating it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting. These links are likely used to redirect users to phishing pages or download further malicious content. No scripts were extracted, but the PDF structure and URL patterns strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2964

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 https://allytemp.ru/uplcv?utm_term=non+flow+process+in+thermodynamics+pdf PDF link annotation
    • https://dafelia.com/files/lemonelapasesorul.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/79926163293.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a65b460aa01---5395069156.pdfIn PDF document text
    • https://defaico.com/d/files/77779422342.pdfIn PDF document text
    • http://ihdbd.org/upload/files/22619953102.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/37349960844.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/69481091860.pdfIn PDF document text
    • http://07-3739589.com/CKEdit/upload/files/82612631856.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d22a5971df---julol.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b39d3515fa2---kegefiwaveboga.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/72444103076.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/pikirosa.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/99316253260.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5944a32b24---lorolewawigidulifazum.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7e5fc1400---29196503477.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/wadaruruwaxonu.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuguj.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/844d3097a63d1de1720f43aaa0e7ef1a/jutogawokeritegitixeruki.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f933cbcf501---mupavevomazalawolejeru.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/74090084739.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/wugesomaxobuwased.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/12918393749.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/tozofonazepav.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/dadefu.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086eae09d5dd---70327136230.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d130e42e1cc11c92d6d868ad92af7f09/judowisetivuduxaxuxekumus.pdfIn PDF document text
    • 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_off0000e33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33C 18432 bytes
SHA-256: fa0bcfa740ffcf5cb6ffe2a9efab426299df23adcb58d3baaafcad29fa1f6aec
font_01_sfnt_off0001136c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B83 11064 bytes
SHA-256: 05509b5ee8c2354c0045fe74e6d84b6d75ecc720f336cb772225929ebf2c6128