Malicious PDF — malware analysis report

Static analysis result for SHA-256 0795e0933668fe61…

MALICIOUS

PDF

88.6 KB Created: 2021-08-25 04:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ecc63f3c2fd3874625a66c960d8001b7 SHA-1: 4834897f325a76b88a1b3a5a2be52b2a9233c320 SHA-256: 0795e0933668fe61851107365704f21aa2a1d81da8b500b20561bc691cfb2393
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links align with techniques used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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
  • 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://massageindex.nl/images/uploads/nuwejigo.pdf In PDF document text
    • http://joesservicecenternj.com/userfiles/files/jekekurumelozafe.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609afcd8c8bd3---7657816216.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/xurudifewox.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/99469899190.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/rrso7mu9hviunng394o6n3i59t/25476088995.pdfIn PDF document text
    • http://cityhighclassof77.com/clients/9/9e/9ea685038b5a197d2022a69b8c6b162a/File/91208115215.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/89044321591.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/847ea227777390b5853638cf73a9293b/73108229917.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210615231154.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/a1a5be1750fa31282d7f2f115b9acd65/xamewapeboxaj.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/24865362155.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/20810838176.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/gajukamokuxelebibalibi.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/dusekuxelevo.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/29167254103.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/rna98tu67h8nad9b2bt70fti65/zirizawuromadomiz.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0dd30604b7---ritepeduxijajas.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/be568a683925e9d38f43b91f9c84d604/65685754076.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/92908644769.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///48087902601.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/99302204425.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/57965207425.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/pelawul.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c198973ffd4---ratetesupobumanekokip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=coy+in+tagalogPDF 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_off0000f799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF799 10028 bytes
SHA-256: 4cc4ac7285a2dab2d91ae3e5518d3fba2729b37e0423661fc30aff7802ad268c
font_01_sfnt_off00010e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E01 17880 bytes
SHA-256: 2fa9660f234a72c62b17563f97bc2f51176ed456733b19f279a28ec4b57a7ce9
font_02_sfnt_off00013c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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