Malicious PDF — malware analysis report

Static analysis result for SHA-256 8836d9ea8c656270…

MALICIOUS

PDF

75.7 KB Created: 2021-08-24 18:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f86e10fc318e33870e2741db2870a4cc SHA-1: bff2f1cc3211d9e917523e9dae8153ce23f53c18 SHA-256: 8836d9ea8c656270320d9fb0321977b5a39ca517c1195823258c3bd2e7032467
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised websites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://gursakaryahukuk.com/images/file/redimalejik.pdf In PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794765a2b33---46917334056.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/xefoparifumudaja.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/67761363892.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074939682ca2---89189506305.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/5q6llmsrdcvsq8d2efh0ef3217/radudadivuk.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/zalanimebemavazelize.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/5393d1e30c26cae40a92fd174bdcba63/xusolisevesanodoxerezives.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/lojowuwidagero.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/vuxedezavazenajazu.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/d43945e74066b5b84bb62d1034f238f7/93156218126.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/82483214857.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/be32a7f18873602db8cdab1342e6a135/78311481051.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/61250923721.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/efc18ac6368d5a42c00eb4cd00216e82/5780137817.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/24095454368.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/oesq6v1vnkjk50otmpmf3jm80d/sogarovami.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e388cbe09---37052921422.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/66331293905.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/9274907211.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/k194cpmn8tpuc5s9opmeu6djc9/ladosogerekoziju.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/11716073416.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/27c613e902aac73aa3dc16ce7518f9a4/vomabobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=36+inch+cement+pipe+pricePDF 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_off0000c58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58B 17360 bytes
SHA-256: 33388c6e91c09983e75785e4db0178e0c8370e66f6b24fab461b3bd6e203ff41
font_01_sfnt_off0000f21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 10384 bytes
SHA-256: 212b494f4f4f8b924f55058535cccd5b10700cfd8af93b22087a990efb1bf776
font_02_sfnt_off00010956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10956 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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