Malicious PDF — malware analysis report

Static analysis result for SHA-256 b071f83e16db502d…

MALICIOUS

PDF

86.0 KB Created: 2021-09-07 15:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f675bd9d52b94e67c50d88125470e89f SHA-1: b5eeb2bd3822967cfe59127a8c023a0b6417b346 SHA-256: b071f83e16db502d8d5450a9d7de5adebb5ad9d1e87259c77b1c5b7e5e94deb9
124 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised or disposable domains. The ClamAV heuristic identifies this as a phishing trojan, suggesting the links are intended to lead users to malicious sites. The file's structure as a link farm, combined with the ClamAV detection, indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4722

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/zosuwexan.pdf In PDF document text
    • http://abimobiliare.pl/pliki/File/geguzowuwewefuzusis.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/sidutedatik.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/pepumitugasuwokagu.pdfIn PDF document text
    • https://orrizon.ru/images/file/25197499657.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c004b720d3---lepaperodedima.pdfIn PDF document text
    • http://faxik.online/ckfinder/userfiles/files/78377833394.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/h11h2uk813ko454dbvg6j8jpi6/tuzititugebatol.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/ffba5f7ef42e633bea1a900aa2c6181e/57592508933.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/e4g510db458b7ep52sskbu95q9/97410905615.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/makuxoluwopaganeleso.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/75d4364a25f5ed867002bd52b634d605/34966978332.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608af45e098a4---lijanasomazagaza.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b738d5c38b8---75307743257.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/98491822242.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/14308606491.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/nadamedogulunituxa.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/sogexagotiwomopab.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45d0527004---bijuvizoj.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/48941584723.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/33349033609.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/5b0145a0b1f0b18c6b40019fa10bbdd0/40633955420.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/tutitutixiruwomodivabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=teacher+stress+questionnaire+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000129ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EF 18896 bytes
SHA-256: 3d28212524aec0cf88e81fe95aae64498145230a9e79e2a5fc49bf8d632f7dd6

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