Malicious PDF — malware analysis report

Static analysis result for SHA-256 85087ef3887f27f8…

MALICIOUS

PDF

90.2 KB Created: 2021-08-02 16:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b42bc09d84eb67786bf5a948ecd5f219 SHA-1: 4957982c86510f589a183a48cbff45b03d220e6b SHA-256: 85087ef3887f27f8da26134374b962d494bf5e08b1097bdc09d8e1f09dab010f
196 Risk Score

Malware Insights

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

The sample is a PDF document that exhibits characteristics of a payment redirection lure, aiming to trick users into believing there are new or changed bank instructions. The presence of numerous links to potentially compromised WordPress sites and the ML classifier's high confidence score indicate a malicious intent. The ClamAV detection further supports this assessment, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/fc758de8786860edb8edc60440bf0ac7/rawatesobetabomelad.pdf In PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/d5s0uhdb2mdv9f9shlnnldhknt/19024982552.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/61644301804.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/xamurepovu.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/pixiwis.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/33683258244.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22ad2cece9---44141707750.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/36718922726.pdfIn PDF document text
    • http://specimport.by/files/files/peravesod.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/e6e6f90761262b4659a65379d6ea39cc/38216099658.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/fulegid.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/81407202370.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/12df9f4cf5b13c4a5cd834a6579939f2/85886629803.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085e94bbfd61---xurakogari.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee8476ac52---wejevikuz.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/44435803422.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/xezovamokisesix.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/07a5d0bcb5c68b06d25423fff6bf423c/72602904139.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/texorasiselibi.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/507d97442e5b8cbde70259ddc4c51676/49055440918.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/befubozolen.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/jurudixowikun.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/22838398713.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8e6d9f3f9---24010353755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=conceptual+framework+and+accounting+standards+test+bank+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_off0000f9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11201 17244 bytes
SHA-256: 28f439f4b971c3f25e183912fcd70db2c07a997a6d03f706509e80b877b1648c
font_02_sfnt_off00013f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F10 11412 bytes
SHA-256: fefe05da296ad37aeb269cf5c3d93671a3327cfb268a0bdc72e32977ff075a6b

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