Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24aa0384e394a19…

MALICIOUS

PDF

83.5 KB Created: 2021-08-26 02:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8381ecdb64912280d5d9ae92ff76d68 SHA-1: 0b178604017a5f96760f14c9d9d177a86be5f8c1 SHA-256: f24aa0384e394a19187981127d0cd6cf05ad1468225ecd3d09fcd66b51d45b6a
196 Risk Score

Malware Insights

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

This PDF was detected as malicious by ML classifiers and ClamAV, exhibiting characteristics of a payment redirection lure. It contains numerous links to external sites, many hosted on compromised WordPress installations or disposable domains, suggesting an attempt to distribute further malicious content or phish for financial information. The document body, though heavily obfuscated, appears to be generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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 http://autoscuolauniversale.it/userfiles/files/dipurezabureze.pdf In PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3848c85b76---91368470419.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611770a564747---51308231103.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/gofekosokuboxatubiz.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f26f7cb9b---xuwarikobara.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/kowanazilamagarukoratage.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aa885303df5---66431276381.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/de13cd7d8c0166ed04c8da25a312cd84/92785075442.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160afb510b53a0---34805149913.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/74989465709.pdfIn PDF document text
    • http://dmkert.hu/files/file/18878289686.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc40d48851---5462840843.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/23311344000.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071ac0569d1d---73126211089.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/xalemivibolenibegoga.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/wurubabekasezeneguru.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/81490971856.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/88157763320.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850dcdc5663---58354349993.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160b89ecbd5170---28473915320.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/40421452764.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/leguk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=lottery+results+tonight+set+for+lifePDF 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_off0000e27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27F 16804 bytes
SHA-256: 8a3a75a7c83ada8f6d289a272e656a9114fb35deadba459b461b669b46671a55
font_01_sfnt_off00010dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EC 10504 bytes
SHA-256: 40ae4a0176885d9223ee1804b4f032686a42f874c5788b3e3c507eb8ae7c3b02

Open this report in the interactive analyzer, or submit your own file for analysis.