Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae5b6fd75caa103…

MALICIOUS

PDF

86.0 KB Created: 2021-09-02 01:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2ea8dda2c5f14671428d2bd19cf90027 SHA-1: 8e8fbad71fb7ae9427a36c3e49d005cbb56991c3 SHA-256: dae5b6fd75caa103ac9b9788f2495dc98f6e339bd7b7d2d1eebfb366f0c92c51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to host further malicious content or redirect users to phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are designed for SEO manipulation and hosted on disposable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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
  • 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 https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/ej90cg6r67h3vmgj7hlkrkh0h4/nozuw.pdf In PDF document text
    • http://maility.pl_adresuserfiles/file/47369568026.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/eb8e7f7fc9596c7e7d15ebe02d8a40a4/zejemazesukin.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/54703514348.pdfIn PDF document text
    • http://charivne.info/images/file/kakekutatesinibelimefuwod.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/n3mdut04cqcgfl7co3h3g87nsn/fapuvanurifopeforakonutof.pdfIn PDF document text
    • http://vinhthuan.asia/upload/files/72217370517.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23817d049f---ligolomi.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/xebinomowagenuwiwutavewu.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/69706252412.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/siparadumivatujilumo.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/uipsfubc0ajv9vthv16mbr4uaq/wonigaji.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/814d4c46bd066632804244be239c3fac/zosem.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/25319974190.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606e244fa289c---42191653474.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddaa643f29---65740619645.pdfIn PDF document text
    • http://change4best.ru/upload/file/59344312893.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4f7867532---lodubom.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/metupatoduwitif.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/c217b52130729c31c5415c7e91e390ea/lapaxovuwagajofuruw.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/sawolezezafezesavazuje.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/46107207552.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/xitegegutovogufutibevaju.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e6eed65c8---godadezipopigoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+confidence+game+pdf+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB63 17684 bytes
SHA-256: cc288bac839ea111af204edef614a12dd002b9cd952a2a55577a98eed227f756
font_01_sfnt_off00011980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13197 10748 bytes
SHA-256: a1d430bc3fcac9fb739b9db05361cdb1bc3b1c15ea6d3089d810231fa6220a23