Malicious PDF — malware analysis report

Static analysis result for SHA-256 2970a6b4a23aff2a…

MALICIOUS

PDF

84.9 KB Created: 2021-08-20 13:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 37adfe0f31fecf0c51c345ecfb313754 SHA-1: 97ab72e7f9a5ba265388876777f81d82fd3e4e7a SHA-256: 2970a6b4a23aff2aafec77dd313a2a9d16751e671a6171ac1b5cb452dc3fb9d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, specifically within form upload directories, suggesting a link farm designed to host or distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics suggest it's part of a phishing or malware distribution chain, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad128ab070f---lorakojogiju.pdf In PDF document text
    • http://argol-editions.fr/userfiles/file/20926770281.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/kep0hqsabpvvm0diffs4oakp83/75624053151.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/3df99a4557a057cf966291163795ca78/wejotarejiweluzod.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/sapamikuf.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/59475502797.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/ln9ijhrjag5prnhu8amo3ln2rg/vutosoga.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/d4f23938c68812f79196c1f82d51d17a/9992041312.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160761ed97f19b---nidebefejoresedazojavotig.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/16337152453.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/pupivaxajo.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/libot.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/13194991625.pdfIn PDF document text
    • https://alohasafaris.com/files/takepolavoginibojir.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/83331110648.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a87b0323e4967b1080b7c9656ac0a26f/turefojovexoxasukosoruj.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/vqo4fs814o5k6fhr1vatv06he5/13956125873.pdfIn PDF document text
    • http://ranagro.com/files/koxulugiv.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/gumolasan.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/79378144274.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911c6af1b78---gubedesonaravezibodawiwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=descargar+peliculas+antonio+aguilar+megaPDF 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_off0000e55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6F 17728 bytes
SHA-256: 3b34dbf2dea560730e23fc7a7f7bc535872c63bb80d33b70fefc361e60544a5a
font_02_sfnt_off00012a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1F 10816 bytes
SHA-256: 9876860b575b9a4305c9a73421d2e45730287e559ebf9be9a0ca00f1647097a3

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