Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a55ce5b9a71f67…

MALICIOUS

PDF

90.5 KB Created: 2021-09-17 01:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df9dedc87fbad41fa0793fe741d4e431 SHA-1: 2a55462c1a714a19f429025421917fcab6d9cfbb SHA-256: 22a55ce5b9a71f679176b16b48ef863d1273b90dec6d2a8e2ca6205e4fbc1658
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly suggests malicious intent. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://pixomot.ru/uplcv?utm_term=evolucionismo+unilineal+pdf PDF link annotation
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/j3hv5sujfp050kt7r7fd6tkq3k/jogufi.pdfIn PDF document text
    • https://quizai.com/uploads/files/rigaxadezatoriz.pdfIn PDF document text
    • https://ksboutlet.com/file/files/ruxinogovopivowakilukag.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/66937975241.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/43923068896.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134b7f8e5f0e---jesupowemib.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/59082692995.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/33796563634.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/12461508053.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/4075785756.pdfIn PDF document text
    • http://gtshotel.it/images/file/nawugas.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/34371787491.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/widixerilalobojaxizusimek.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/31139238282.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425d1f1a9ee---mofaz.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/sujalowagexovifazex.pdfIn PDF document text
    • https://glozor.com/userfiles/file/pusamoneg.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/sexemo.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/bibajasalaneraxumukugo.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16139310dc5121---10920894267.pdfIn PDF document text
    • http://centromp.it/userfiles/files/63502141575.pdfIn PDF document text
    • http://agro-partner.com/Image/files/vopoga.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/12224843505.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_off0000fd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2E 17808 bytes
SHA-256: 32dfa6032c5252e6c2d15a32a7c187438f280bdefff5079b3b5f88be83592b9d
font_01_sfnt_off00012b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5A 10732 bytes
SHA-256: 9b4a778dedf19f5c26b0e001461f14a812063bd5527321c81e40efd51144bd36
font_02_sfnt_off000143f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1