Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7107ca66efed742…

MALICIOUS

PDF

73.8 KB Created: 2021-09-21 06:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0c8f003dd953a1565235f7986b12882c SHA-1: 4799f369c48ef8fb6f3058da2bd3bb8119f54af7 SHA-256: f7107ca66efed742887afb480e714a3e88e67041978816f853ed2a070c487aad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via these links. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://laborke.ru/uplcv?utm_term=what+is+ipv4+and+ipv6 PDF link annotation
    • https://shen-su.eu/gfx/userfiles/files/tipumugewekisoxid.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/luxujonavevedabafef.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/43472549235.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/gikaxa.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/duregifaramex.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/h8ntksvl6rjgtl8bp8t5aefqcj/tidaligusomodujetabu.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327f259e1a6---49124168879.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/jukogowanodigekimavaru.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/kotofufijisasosulijejo.pdfIn PDF document text
    • http://imaginove.eu/data/Files/93080441505.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/44365042337.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/bodereje.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/128cd5a55ea2d68daced305b670a44bc/nawatojokiwebivexowomolig.pdfIn PDF document text
    • https://langumeistras.lt/i/File/57265942177.pdfIn PDF document text
    • http://med-os.com/user_upload/file/kesikikofejuzegodajusexet.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/finumawebanatakenone.pdfIn PDF document text
    • http://upakuika.com/img/file/42745148778.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/rrbespkqkqfnm0fqj5v561f74j/dejogibegobovojizagudol.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/51825209557.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/vosesafan.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/83640858208.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/68275420904.pdfIn PDF document text
    • https://viceda.com/userfiles/file/10011521420.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210909165427.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_off0000c1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EC 10396 bytes
SHA-256: 2e24da0f9ad09cb6a8be914abb42191e026ba37d5b0f62b9a010a7a5abbc3487
font_01_sfnt_off0000d971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD971 15772 bytes
SHA-256: 5aa063432d494ea926022a20bd12e9af8e1f0986057c5d58668b7c104f6ca1cf
font_02_sfnt_off0001019c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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