Malicious PDF — malware analysis report

Static analysis result for SHA-256 df76703f1bfd67dc…

MALICIOUS

PDF

94.8 KB Created: 2021-09-11 04:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3feee02ae19eac0cd143cfadaaefe5f1 SHA-1: 9e2cd9fc5f37f623362bf067801d4f76045a5a64 SHA-256: df76703f1bfd67dc1f048777d5328eb7fefa2a7a7ebaffe4e0d61b7ec184ebca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://chcial.ru/uplcv?utm_term=naruto+movie+3+full+movie PDF link annotation
    • https://dangeloremodeling.com/nbloom/fckuploads/file/79219371473.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/82607884662.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1630584712.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/ada37a4e3e234e780739f2b2ebb1c79a/vuwirijozixuwewikexetejuw.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/zedukimumajuguvezebiwud.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/60405681910.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/wixegini.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac0ed2001e---4251009554.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/2779747312.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/semuw.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/vimasisufugoxu.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/46307968053.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/u5qkr98duq9mcaclv1r3v7m5ka/75701689018.pdfIn PDF document text
    • http://artdental.hu/editor_up/xijupij.pdfIn PDF document text
    • http://voijin.com/userfiles/files/mofij.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/84554271888.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ba2b8e6de---31152417960.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa688a6f1b---78921240071.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/menota.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/29084162476.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/88117727100.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210903211853.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/dipuzuzikupubawerawoki.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136874450485---mogigirixifaruroxodikib.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_off00011006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11006 10416 bytes
SHA-256: 7ae878fa0e637a3ebd6a0fdacc8ea6364aec6aa6d2e4febbba7530c917eb4371
font_01_sfnt_off000127ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BA 17800 bytes
SHA-256: 5311256f3e2c04b7371714ab8aa3168834aba0a9bb61b01ee5f6ecfa654f7549
font_02_sfnt_off00015619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15619 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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