Malicious PDF — malware analysis report

Static analysis result for SHA-256 738f81d804f48c0e…

MALICIOUS

PDF

82.3 KB Created: 2021-09-10 10:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac77395dbd5827c39f144e557b0459cc SHA-1: 487da2466ac4b16b6a198d45cf87eb1ce33055ba SHA-256: 738f81d804f48c0e7d00a866c9dda31a0ac5b90c6d218874272db5d45e93686f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to numerous disposable domains and compromised websites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=action+replay+heartgold PDF link annotation
    • http://faradbox.pl/files/file/20082407843.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/xiwuwiwuxol.pdfIn PDF document text
    • http://rapet.hu/files/60619207304.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/40564448389.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/wegabelobarimuse.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/selurafoma.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/43643785673.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/013f1b31f425161202478510caf2eab7/lumofumemelex.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/laxosowu.pdfIn PDF document text
    • https://datenglagi.com/contents/files/mubuwowutumuzek.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/65419500222.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/36362398885.pdfIn PDF document text
    • http://saktigroup.in/uploads/18120982778.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613777fa6bb5f---488272822.pdfIn PDF document text
    • http://dnepropress.net/files/file/fobepar.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/gowufakokitizina.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/larudipiragaxumogotu.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/xadopunupabelara.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/lijitowosu.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/xejujumomerujusog.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/fitemogavifigupaxijatis.pdfIn PDF document text
    • http://yongqingtech.com/d/files/vikisapomixijas.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/15695016575.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/u6k156vo37d4qupmfur3nihp20/88686189123.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/11409181673.pdfIn PDF document text
    • 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_off0000dc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3E 10720 bytes
SHA-256: 4ec705086adecd6084c2908ca7af5ad3b296c3a7a16fd13fc7aba1a8f7975429
font_01_sfnt_off0000f495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA7 18052 bytes
SHA-256: f0da624e5019dea9e57d61663b8b679b581449a91d0c819d486753544eddf06a

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