Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bbb37571495a301…

MALICIOUS

PDF

70.3 KB Created: 2021-09-04 04:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 05beafc61258b423c660f2fed00b2f69 SHA-1: 42fbae3c1a898d47356f614dbce53eae36decd35 SHA-256: 7bbb37571495a301341d5cc439ffbc163ea7d9f5910359603ddd1d4058893a4b
154 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically classifying it as a phishing trojan. The file's primary function appears to be redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7796

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 https://zoldlepes.hu/userfiles/file/23080418336.pdf In PDF document text
    • http://livestocktool.com/d/files/70355428546.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202108310126352875.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/9114727444.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/24681823082.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3910fc3e37---dalukabu.pdfIn PDF document text
    • http://accronline.com/userfiles/file/pumanapopuvuwet.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a015bee6716ce67815fbb4c4530f1f42/jazenilerisizuvilewi.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/0f88242f700026337840b170644b1168/jomalopazinelota.pdfIn PDF document text
    • http://wjcopy.com/upload/files/29131650319.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/58807077568.pdfIn PDF document text
    • http://prosquash.by/data/dozegilibigede.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/gufomipiguzukola.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/dupixej.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b33813c7c---84944646691.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/80473486049.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mepajil.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/68754568128.pdfIn PDF document text
    • https://orrizon.ru/images/file/61866972273.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/pexope.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e558d2a4a---42585741516.pdfIn PDF document text
    • https://isleo.com/i_photos/file/bowimubasuvoturi.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/d4b404e283395f0bbdcf7f1ce7788560/vazafinotopad.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/kufufasolamidejuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=2017+buick+lacrosse+premium+owner%27s+manualPDF 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_off0000d802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 17476 bytes
SHA-256: 4d5c3b2a2b9e474d4a45fe5b6a12db63da636fe2d18cfb114e6aedf151f58162

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