Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a104b70b0fab4a8…

MALICIOUS

PDF

88.0 KB Created: 2021-06-26 00:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c2593d1d30d50e2c81e003c524075f0f SHA-1: da78f53550682510362a28f9af006806c55a4831 SHA-256: 2a104b70b0fab4a8fa82ff0879a97a4e7e05c43006641382c627e4780a165a20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV both flagged this PDF as malicious, specifically as a phishing trojan. The file contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/fa3ddb53e8319df47608b267189b8097/25751141348.pdf In PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0cfbd46b1---mikusa.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/0c0baa0da20a9c036516b5dc0366d8fe/rixos.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/20767262735.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1624142195.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/6bfe056c48180e98bf84d7f2609f07be/83060717068.pdfIn PDF document text
    • http://charivne.info/images/file/xotidipimaponit.pdfIn PDF document text
    • https://cmoretv.com/userfiles/39768054069.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/jomumefitudegapaxede.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/ec1245e84e8e928d734fefda445420c4/69887970539.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/f35456cbd9b2bdf0963e0b4ec3a39259/36259878152.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021052322555773499.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/dutunuretoboxazoza.pdfIn PDF document text
    • http://www.samlab.com.tr/wp-content/plugins/super-forms/uploads/php/files/dfa8r68rp5180g91ab51r8afgc/fixufapur.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/kurinu.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/f89770ebff46bf6bfecaf1f966147e42/6097164781.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/58936754309.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16096bccd482c6---8335645932.pdfIn PDF document text
    • http://polkovnik.su/upload/file/vurakikimevi.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/efomj3b4hjvdmq2rr4i60frjt7/10654899805.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/vavisoxofamebugitekul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=project+management+and+teamworkPDF 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_off0000f592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF592 10716 bytes
SHA-256: 7ed88b0c75d88aabdd6b58adb2e3b11dfe1800c4f2e8ad70e28882e865a269b4
font_01_sfnt_off00010e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0D 17180 bytes
SHA-256: 51cf357644a88c95a6356e2f88426c7aa0398143c2150fe5cbee2534f19fc74c
font_02_sfnt_off00013aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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