Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e628829fddd95ec…

MALICIOUS

PDF

77.9 KB Created: 2021-07-31 22:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0dea8dedec6e7c4046d5a1bc8b7002f5 SHA-1: 8b8bdb9d907c667bad70934c37c056b8b042ea27 SHA-256: 5e628829fddd95ecec86c7c801c7f2dc063e627f69859f03a59988debbba7fa9
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The PDF itself appears to be malformed or obfuscated, as indicated by the differential parse failure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6760

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/60e6212c243fe84cc70f9836420c3b87/simunasu.pdf In PDF document text
    • https://hophamthaibinh.com/upload/files/jumirabexurudukatiwi.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a8acdec33fc---womedinejisudo.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/nikijevubavanan.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/7970015089.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbd18c808c---fomilozev.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/426j92nqmrt6t5lnfa9f9tuo8k/63625029689.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/db0ae948bf1b0d0693676fc0c7568e34/kefidozexemenud.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa96e5eff9---godin.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/34462015737.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/26281187607.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1e3abedd4b60a809dddfbb09c865239d/45235966257.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/gafovizilijagisasujog.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/d7c600867e5d3233e7082820918b60f9/94118807569.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/1c62d24bffed7e75812025cef6cc3d50/nevafisafidu.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/72985495804.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/pejigudazarek.pdfIn PDF document text
    • http://esistore.de/userfiles/file/7067282223.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099b6d1007d8---38475742953.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/45199695482.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/jigelevevub.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d68dc33d8---10120062832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ginecolog%C3%ADa+b%C3%A1sica+ilustrada+mondrag%C3%B3n+pdfPDF link annotation
    • 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_off0000d6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EE 17796 bytes
SHA-256: e96126360bbed79544c10e3d1020e6cb35708727872d629b9cb338d6861d6ce0
font_01_sfnt_off000103a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A9 11620 bytes
SHA-256: 665b075985982a51909c6c67ba00f7cbf2c7535dad5fd5ba161faefb46398130
font_02_sfnt_off00011e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1