Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a5b2df60b969b6…

MALICIOUS

PDF

158.5 KB Created: 2021-07-17 21:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0f95d2a39c004e0c85bb37d557ce7f65 SHA-1: dc44bccd51c821d5a9c5a22be7e225a398dd5968 SHA-256: f6a5b2df60b969b63e0681f1239da257bbf7a0f9268da6119a2843a383d62c70
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution scheme. The embedded URLs are the primary indicators of compromise, likely leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837105a8882---tagorujuzejoxiwi.pdf In PDF document text
    • http://lt101shop.com/userfiles/files/55131068621.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/0f626230603a3ebf71723d32ac425d50/95262224340.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8004a90222---15832850911.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/wifolotemojipixasetevekaw.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/c1d41a5346b5d3006cc83eb65462ff13/gitemoduxubaxodum.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/fugebupiran.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609751a5db335---dikon.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93840176fe---wabowasadopexevizakaz.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/foxipo.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/62569659120.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/2591b12b77ea6958c59137a8c36e4dc1/bolinizikozefovovi.pdfIn PDF document text
    • http://lg-palette.com/upload/files/19116593705.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c018c1e370---81154924204.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/bakqg9bbk46f40e36einig4663/gasolewojemaxolifufup.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/papotufadanolowoj.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/7e4d6580e51b445529b76b726a518a70/88472993531.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/9l1abke6ekesiug2ev23anm69c/zosusadukomidozalijije.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/n985k84hvviojguetjgai71b80/31381446161.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/luzinerumas.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/15948829310.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/wefumidaxovuzos.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d47bc31711b---jojigerurogafixenotevoduv.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738350c6349---37498577746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=50lbs+is+how+many+kgPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F3EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00020bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20BFD 16040 bytes
SHA-256: 7d1ae35ea594e3ae47d6e2cce0647cf7ac0e6c67bfe6d0a6cb032aa46aa39942
font_02_sfnt_off00023587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23587 10816 bytes
SHA-256: 9c8c9253e9261698ce8f94748cdeea4c3ca3e1de21b08030ebbf89829ca482c2
font_03_sfnt_off00024e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24E51 18108 bytes
SHA-256: 977be2daca865e1890da06fb8d2c8a748e8ca8ef45cf49f60ee0b3a3c5d9f94e

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