Malicious PDF — malware analysis report

Static analysis result for SHA-256 745861b8992ae033…

MALICIOUS

PDF

85.4 KB Created: 2021-08-08 21:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d235d9df55987bde2f2fdb6d210c578b SHA-1: c5660e462b3c1e81e07b09417d04347eb70e2914 SHA-256: 745861b8992ae033c3f4e318bacc14264348d44afe70aa28d6300a249d7a3bae
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm used for phishing or malware distribution. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly suggests the document's content is designed to trick users into believing there are new or changed banking instructions. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://yapluka-services.fr/userfiles/file/kalipiwejovuti.pdf In PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/34173671769.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/godebuxevujiwakafo.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/2970222835.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/ttu08jl490apmtcrqtk95hkrop/jiwulolaxi.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082a8f182798---6069790066.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/lewekunal.pdfIn PDF document text
    • http://eva.am/files/9ffdb7a97f96f6f4.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c9b237e8e---94678238478.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/lubotole.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/ge1u1k9kaa4atc5q328i0spke6/xoxejemufuz.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608735bb09b95---togeki.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/49495346119.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/12736224dee114c34b4a80f787d74bdf/47532220265.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/97273900564.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/e0lou9em8tr2c926titbi43fln/31375229961.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4609276511dca80998feee55552e28fd/16265760647.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608472c7f271c---12929134928.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e75c8a0e93---53141978147.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/fijavo.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/467746e89bb4ceabd17fc6b2a665d4ae/88160142990.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/obv709k3uo5gvc89mtlofvhcds/98565093463.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/64862456923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+are+the+modifiers+for+cpt+codesPDF 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_off0000e820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE820 16940 bytes
SHA-256: 5e0712b74f8274ffe1a5c4b96a74edfa53543fe221f65fdfca0b1957a42f9bf0
font_01_sfnt_off00011425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3C 10728 bytes
SHA-256: 7736382d7fdd9d2d3036ebb0b41c47fb08110c9a145e6ea8536d48c2279f1827

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