Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb75b9f094fcc029…

MALICIOUS

PDF

67.9 KB Created: 2021-09-06 09:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 113affb6298eabf93e31a6753b59dae8 SHA-1: 9a12e816a8aeee48041eccdfde45afe22d6c83ac SHA-256: bb75b9f094fcc029de07a82d31ee2dbe0e0cf6878f4bcbebb42ee1537ffa2a5b
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO abuse. The primary function appears to be redirecting users through a series of links, potentially to deliver further malicious content or manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6083

Heuristics 5

  • 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
  • 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://rocincorporated.com/domain.com/images/dynamic_pages/file/pijumogoli.pdf In PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16127730618eeb---wovomawugekibasibonowa.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/nalazibofapi.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/pisexobitorekag.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098b75a659a3---42041255521.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/nefowozapegojokalis.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/dosefezi.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/fejojivimepexeder.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/savun.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/nuzegitipajetotawor.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa53d45612f---94095222727.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608394c9748c1---jogave.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/50470153888.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/gilozoni.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202108250412255416.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/jupinesadurabomala.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/tewulalidaxeji.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3298d66945---76597599554.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/gipamejilipabodeme.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbef796cd1---66729457566.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/76625474886.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/89799183971.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f614430f0---xatap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=alchemy+books+for+beginners+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE54 16144 bytes
SHA-256: 500e129464727c27e5ad4a92bf84f58e268a695bf27bda646cd6cb48f78213e0
font_01_sfnt_off0000f7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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