Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0b02f4b9d70327…

MALICIOUS

PDF

70.4 KB Created: 2021-09-26 19:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 021d760a5f43393bf9214034f1779e35 SHA-1: 0b2fce14b169700207f6c02d5d4c0c8444ecd7ac SHA-256: 8a0b02f4b9d70327c25f67c2f729b1218898dd2c2d68bb38a1a62575e8cc0e8c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The document body is unreadable, but the heuristic firings strongly indicate a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f45bb1b73d---vexewokozepajajaziperi.pdf In PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161334ebc161bc---77834998719.pdfIn PDF document text
    • https://camelcarpet.org/d/files/8725896745.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/592974047f739fd7c5e3366d1bffad58/11921383170.pdfIn PDF document text
    • http://otczenacts.com/media/files/17810597615.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/jozoludilotakofalunud.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/25b087d9766c101eaa9456928943f642/xadezudulepogizi.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/64e925abedf97e53fe688f5cfafc5caf/zuvas.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/90761936754.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/ranotebuniz.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/1074826972.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/40460636476.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/88628412963.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/78336989199.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a90371e912---27464258840.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/71282321987.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/28469989483.pdfIn PDF document text
    • http://glassick.com/userfiles/file/vunikafenowigukavar.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/fopagowupawilefezebifuri.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/rozelosorizaxerekibe.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/xesuveregor.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/19099379214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=limbo+android+apk+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000b2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D0 10428 bytes
SHA-256: 086d428b26e698ff54137363d2d77e47f68ac2262bd50dd469dbfef41d6cd179
font_01_sfnt_off0000ca1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1A 16432 bytes
SHA-256: f3238dda04f81b7cb625502d7868805b7e9f9b165ce85f5e768c32174dd6edd5
font_02_sfnt_off0000f406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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