Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8207ebd30c1491e…

MALICIOUS

PDF

93.7 KB Created: 2021-09-01 21:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 61272c30bcdef6fd7cf56dacc84b8ee3 SHA-1: 0cbcd3aced71bbc9ce516e439ea4bdcf0f7b6300 SHA-256: e8207ebd30c1491edfc11d7b4b1339528217589f1426707689cd9f962b780101
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other domains, suggesting a phishing or malware distribution scheme. The presence of multiple links on potentially disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9228

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 http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/4996306d1f2228b1a55e586f8e6ecb0e/sebuk.pdf In PDF document text
    • http://mskabel.cz/UserFiles/File/gafivabuvuwukajewidut.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/xegevupifepuvef.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/92024861516.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4a74af881---fupuxabuputepudugasuzove.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/4920951144.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/jivadil.pdfIn PDF document text
    • https://digireg.dk/upload/jiluvanapaz.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/982dcf3cffa7989df745978e2169ff6f/kosonekid.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/pvsd26avh5nq6a5g11u4a606f5/34298202422.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/44274164607.pdfIn PDF document text
    • https://vieclambanhang247.com/upload/files/48635467337.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988bf8e3c4f---65638635128.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/wojoburapakame.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/64780756459.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f250ca153---82395416084.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/21993060838.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/58c3c40997def1d1be6724e00ed094a6/xulerodewumexakomenawev.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ce9c2df56---5633731942.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/duvuwamu.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/bexomapasimosedutilemi.pdfIn PDF document text
    • https://aneri12.cz/res/file/tagonurudodafetikaporeki.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/sizuwosiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=small+black+spider+with+brown+legsPDF 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_off000110e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E2 11352 bytes
SHA-256: b7cc0b970741b7ab5f2dffdcdcd1cdf166091ff9d3737df1e64fac197ca4294a
font_01_sfnt_off00012b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B06 18544 bytes
SHA-256: b51a1a5d45f995192bb876d15bbe37088a6a5f20ef0b30074be7caab2d775fa4
font_02_sfnt_off00015a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1