Malicious PDF — malware analysis report

Static analysis result for SHA-256 448dc57bdcb19445…

MALICIOUS

PDF

102.7 KB Created: 2021-07-16 04:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4658f982161206281200f02bb8cd974f SHA-1: 94c378f49ba29e4f8c9f934cb29bb50610fb27eb SHA-256: 448dc57bdcb194450458922a36833992417a25056257b59c68277f969694ec6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the link farm nature of the document is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d97f2ec76---tolir.pdf In PDF document text
    • http://nexxosrealty.com/userfiles/files/73086465025.pdfIn PDF document text
    • http://scantech3d.com/files/5509774445.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9755bc5289---55708275133.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/lubatowidegezafoz.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/59796118445.pdfIn PDF document text
    • http://slsnn.ru/content/files/29548826752.pdfIn PDF document text
    • http://fullx.net/files/lodojaxukivogo.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c52eb88cd5d---35865783899.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/2eac72060d9006e8da7b4dd6f8ac2b33/24225099992.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/c704002774f8559e17b1459ce77c8dc7/24952610401.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076693a4db2c---xadoxawiduralotozevasob.pdfIn PDF document text
    • http://renovator.cz/files/file/64485208104.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/83355129376.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7b0c27671---12795224746.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5b0a87a38---golesuzafofopu.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccd0f9ff15---lunixonedu.pdfIn PDF document text
    • https://madopin.com/calisma2/files/uploads/24792826420.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/8042615289.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/6fc9eh4a81v14956c0o6jkm18c/rejuzemuda.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607198d5967ea---11200844000.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f78edeeb3---rajuzofi.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/87837838611.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/56554f01e9fc969e89f3c875ca0d3a4d/82660568432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=owner+of+comcastPDF 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_off00012e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E21 18120 bytes
SHA-256: d64e5b8ea0b7e34b4dd5bc0cef8f8c7936710779a47ca9d493a373696f07b66e
font_01_sfnt_off00015dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000175ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175EC 10472 bytes
SHA-256: a00e51c7a472b87d81c6ceace405941bfa304c5c030537f7b94581c396b57536