Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4009608c72a31f…

MALICIOUS

PDF

93.0 KB Created: 2021-08-04 21:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 320a490383636f8665b89e45a319ecd1 SHA-1: c1e72a7b4399a3a597681926149d83408abd8573 SHA-256: 0a4009608c72a31fa0ec4c47bdf31ebde9d1517d1402b6081f462b9368b972b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://catamma.ru/uplcv?utm_term=good+acting+tips+for+beginners PDF link annotation
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/n1gccga2gnu2e58ooneshhmfg2/60559590351.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e556002d3---32299049229.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d3da40138---15262319952.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/xipadupir.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb29e09ff8---nuzavoxo.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bedf041b7fb---36347460462.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/ferimotomilutojudabilutel.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/30454626467.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/16804987574.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/momoj.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/b1f61df6273143b4c832e32c831412e7/86728276902.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/s12a1us8abbgl45546icq9vm3v/sunozogunefogud.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/bomofofi.pdfIn PDF document text
    • http://abpaluso.com/upload/file/xotupofujidu.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/xevawegelifibedikewige.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/67092028932.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/n2l01mf9ru8uen1a8qlaa9elvi/61265003494.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/95048889513.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/bitet.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/9d34635f4816f347c43528b9f8f8f11f/zakimosodabonap.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/359af4661845333524ab59950cdad1b7/xowivegililarerumebov.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/d6143e34102bd8f668f2f7911faa9593/52805312023.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/78431587993.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/v4crrb3mpf03m1rqivfm29lrp6/demanerobajarusu.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/17264459180.pdfIn PDF document text
    • 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_off000105b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC7 17036 bytes
SHA-256: 516a09c674b5a9ce0e5026d7628d48f666622fd35ee6f74a73109ddfb1738216
font_02_sfnt_off00014a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A5F 10928 bytes
SHA-256: 78e1a059b8b9e6ca6ebb7dbe644aca97e688be55c53937b7a43977ba81f114cc