Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a1df1f6d88f628…

MALICIOUS

PDF

86.2 KB Created: 2021-07-02 09:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 372b4ada5cb5fa09d7dfe45514f2c300 SHA-1: 813eb7308ac52a42d2d70817401d778c6d2cacfb SHA-256: b3a1df1f6d88f628fe4a3d75ad724daa53c10401a498904f8f6d34fbdebc71cb
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a lure for users to download further malicious content or visit phishing sites. The presence of embedded URLs and the 'Payment redirection / bank-detail change lure' heuristic strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://southwestlooms.com/admin/userfiles/files/tojozefetotunuwojumuvi.pdf In PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/e5a773a9d9840cffd440e35514186f69/jorumikapo.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4599a1015---90144374399.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/9b13936015ac5a8a521a2e3f825afaf1/85108015852.pdfIn PDF document text
    • http://c-amc.com/upload/files/xajexidawekonevodugaludu.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/c1166ad3b48df1ebefa068e558da04b1/xololodetaxis.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094522f4466d---32334824178.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bfb2b47eca932e6fec40f5579a935443/83668790906.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b0e0367f5---37537067411.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/89227234209.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/6naiho9rilq1nv4u4dnhrol4li/ponowok.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/6628b0bc960c8d7512c9b0a0da5a686b/bikagiboj.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/39214575294.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609feebc6fcc1---jekikoxufu.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7192fed545---jadak.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/94623344435.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/sebusilogatimuris.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b82cd8e25---kubevigixudapewu.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/7f0ce0d74be97ebddc3b0d93fd7eb2ee/jinaxuropudiku.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/sqvegpj6380mdple67b9o7ck6a/41388562286.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/82146535193.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/50596450290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=advantages+of+online+banking+pdfPDF 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_off0000ed24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 16816 bytes
SHA-256: bb2e820c168366f23d24bd0486c9ac3ed9c7389e9cc0dd8b715936024160cc3b
font_01_sfnt_off00011913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11913 10852 bytes
SHA-256: 4be39259a0c36cbca0a7d04b7d940151c3ac4dd918ab66078d3c0fd8e9b6c199
font_02_sfnt_off000131e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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