Malicious PDF — malware analysis report

Static analysis result for SHA-256 86974b5b9359d1a9…

MALICIOUS

PDF

54.0 KB Created: 2021-10-03 19:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e7a98e8ef8e1d675e35d556c7ba407c1 SHA-1: 0d5a9c01f7e22ef3e18415cd0fab783d3dd9518c SHA-256: 86974b5b9359d1a98bf6f1a1bfc45cb716110ca3dbf61edc2e77f29f1eb78f24
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to domains identified as disposable or compromised, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8145

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://varosom.hu/userfiles/files/26003379044.pdf In PDF document text
    • https://organicfertilizerproduction.com/d/files/wevipokalewozitup.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/90831766518.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/83551026709.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/fojunatopam.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/96801958214.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/75808415012.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/98239843911.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/gimadupulojoganoj.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/fibete.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/36508157020.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/zegenitunizijoxove.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/d9c5e10ecf51978baf2722fae508fe34/47370447764.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156a48e8c080---56463301411.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0f7b097e0---dujew.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/baximonedixezakixeter.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161342902185f7---rojefezarupenaditovevux.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/35819696059.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/metoder.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/basivagolurufusaxuxiw.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3519456090.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/jutuwezaguveroguwinawur.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/lifoxulovonewag.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/c7fa273d4c7bf83db66b698719b4a00a/94508699177.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/fozalaxuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=meaning+of+the+word+corroboratePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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