Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b131b79ebe830a…

MALICIOUS

PDF

65.6 KB Created: 2021-05-27 18:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 962b3962769cf756a3c8288ce51d59de SHA-1: 6233379a275123d822123d9d8f931df944382039 SHA-256: 40b131b79ebe830a0665242d460f38ac15f7785da56a23650b1ca4cb48a74ca2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting it functions as a link farm. The document body, though heavily obfuscated, contains metadata related to PDF generation, but no direct user-facing text that would indicate a specific lure. The presence of embedded URLs and the heuristic findings strongly suggest an attempt to redirect users to malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9701

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://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/daae1ce2b21fe847474ad4afc08891d7/35206015077.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/791215d71ba964fc2bbd37a8b409c53a/dikawinanumaradoja.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/3c8767d17d034a603d37d375346db8d5/9378004973.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/5accec12ae6a51ea40598e4da65ea689/wuzenumuri.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/kiziropezuzobusare.pdf
    • http://www.anclupnapoli.it/userfiles/file/rubivedu.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c50eddfa93---1267515789.pdf
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210522181352.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/538357d1b5e6810855bd8b30d1bf1506/24011602546.pdf
    • http://videofilm-tv.ru/content/File/farudijekadexoposig.pdf
    • https://yingzhaoliuart.com/upload/file/vunadamedajolemoranofala.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160758092ee2be---62702884615.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/gv1inphltrmf1jg7gq1tfkj3o2/kasemomirurugarubasib.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e7b65237e---wikebebolatabopu.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/1ae05d075ba2ca55323152c7aee1b67b/nenasudatux.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098495676d27---63904442259.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aee3154915---lezezumaxadobinurak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=como+tejer+cuello+redondo+en+crochet
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf08.bin
eec571e7879eb18ddf911b7123dda2cfcf05843392f771359941741d5b6bc2c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF08 4772 bytes
font_01_sfnt_off0000df0c.bin
79c76bd8634fa61eddfa44a23ec5fe47e56f5f24fb6147377b2d36fe6f344a44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0C 11456 bytes

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