Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad589cc419cbed9…

MALICIOUS

PDF

73.0 KB Created: 2021-09-07 21:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 15395323256d1a667dc8974971047eb9 SHA-1: f1ea93e9232010be77967dba80acc8c508348e38 SHA-256: 9ad589cc419cbed9d338ad78b9a9e7b14c30a58aa1c129e93b5e3688c9b9be88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, which is a common tactic for phishing or malware distribution. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://messianic.live/wp-content/plugins/super-forms/uploads/php/files/c82b87bf8ec45eca6c0dcfbcc7a7682e/87901089422.pdf In PDF document text
    • http://checopharma.com/upload/files/39722296528.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/gexekidebojote.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/8aba3d01434d268a5852b8e740de56b5/limukifag.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16089f0861aecc---jifunujexememubowule.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/dosejuvexe.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/42431399467.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/supodapafok.pdfIn PDF document text
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/ed30e95e162da7efe94ee1dfecec2146/telewu.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/76518635444.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/42392886731.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/70811838052.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/74206853674.pdfIn PDF document text
    • http://terralindahigh1981.com/clients/866868/File/24124406503.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/kujopufumigijogew.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/tital.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/f1048f81fb94a862023b25b69b524372/xifapo.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/xukex.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611c0807e0cde---37881925239.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/19607d6ea35f78e0054312050f3f8e41/4802461979.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/oej2c4beol0kk6r1pnron7mca6/tavilaj.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7b286d93e---60004773132.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/c80e002df12096e1925bb5d405da3247/91373561514.pdfIn PDF document text
    • http://epplast.com/files/file/vilejafoluk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=talented+students+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_off0000bd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4E 10240 bytes
SHA-256: f2c3ef169e8c67c7d19a57270838aaeec15f3362482b614600fc7d2f353217ef
font_01_sfnt_off0000d472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD472 16316 bytes
SHA-256: 36e9de824cf2fc8f03fb4ccc378402dc4d4b56232e2003e488a8351cee141b05
font_02_sfnt_off0000fe42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1