Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d226b10da854cd…

MALICIOUS

PDF

82.8 KB Created: 2021-06-23 12:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 46e073c9c28f70e2cadfa6d2bb54fd40 SHA-1: 18ee8ac54ba835bcf3301639d946669030126594 SHA-256: e7d226b10da854cdce86a4f001f82cc24b62c5d8503839ce59dd9f18151f6b8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious content or download further malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/268a462faddf9de97eb2194d6ddfa293/kaxakadasokinubazuxagapi.pdf In PDF document text
    • https://lesura.net/userfiles/file/firulepakevup.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/51060009874.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/13063730494.pdfIn PDF document text
    • https://areicon.com/images/file/gufazubalokefo.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ce30174ed---70082642009.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/5c3a3b27659521018fbb3e45b0b9015e/mimegupovimulopavikupi.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/262049256314be2324f1defcb7b1071b/46611152923.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f4503a56a---jitumigetinozebilujogi.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/jadevev.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/tikipuxesinavufose.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/41923239122.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/90483743676.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607562f2e67e8---41678771711.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/65dfe1fc798f8ecd66583879704c0f48/gonumudolowusosun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=500+aptitude+questions+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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 5204 bytes
SHA-256: 4e48f222017b559c5c7ba9f8b74b9e0a880690eb06da890c694eae3cb725bc07
font_01_sfnt_off0000eb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2D 6544 bytes
SHA-256: f127f3252b8d555624fa4d10dd9103b2e28ea2c84a8f4ae48cd691ad6d2878ea
font_02_sfnt_off0000fe63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE63 12052 bytes
SHA-256: 0f205baacf0c1b1ff4517a358e3444b5282ea85f347188cb0ed13c9a6a7d9551
font_03_sfnt_off00012794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12794 16488 bytes
SHA-256: c1b079531638eb1a3c04db1e02171976729f735878a2208124a2549080c615aa