Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e151b7773cbeeb1…

MALICIOUS

PDF

79.6 KB Created: 2021-06-30 09:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 517ad967cfc7c14e0b650233f6bb026c SHA-1: 64e180756acb15d713b8e669949c7a2e4e17ba40 SHA-256: 0e151b7773cbeeb11324045da8537c391f0cdec3cdc1b06b235dbc6317271a88
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming, suggesting the document's primary purpose is to redirect users to potentially malicious or phishing-related websites. The ML classifier and ClamAV detection further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5932

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://inwebjor.ru/uplcv?utm_term=how+to+scan+a+document+into+notes PDF link annotation
    • https://m-astar.com/UserFiles/files/39702974377.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ab3a945cb---rarorixofogibokezo.pdfIn PDF document text
    • https://onlinendttraining.net/files/gaguvagovetebimulovojora.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160770c6d92d77---suxofosewumesetu.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076db72cb5ad---bagulipobevaxelor.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609f92437e9e2---2527434942.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160706b8c955a5---93506420723.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/16185724312.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/97840712892.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086642d229e2---kiwududufukixol.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/wisepodamimujokuroman.pdfIn PDF document text
    • https://rcot.org/userfiles/file/terizufafederola.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/26250549482.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607946dc9025b---85411925549.pdfIn PDF document text
    • http://jarosi.hu/files/file/16946849072.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/87579808608.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945845e7321---rozanosedu.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/37d6ea63575db82242cf352d1ef94b7d/kalozigonogodixozemovu.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb28e5e624---xazalino.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa69301540---tigeliw.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///sixavazo.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/5d837a3fa87b04261617f1dcb2d32652/lifegagodexugimitafata.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c8c2b4a03e42de2684efda66ce2c9522/luzaxaniriwafapizazofopa.pdfIn PDF document text
    • https://ivaco.it/file/820912627.pdfIn 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_off0000e140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE140 10560 bytes
SHA-256: 54f1abff756e1a44634194189c5f0599b8dd4adf1fda95fae66276fbd107f0a3
font_01_sfnt_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 17280 bytes
SHA-256: bf037c136f16bb5e89b22fa84c28708c2d7bc00f6d371d8fbfae09281386e721
font_02_sfnt_off000125c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1