Malicious PDF — malware analysis report

Static analysis result for SHA-256 98df8691a40eb02c…

MALICIOUS

PDF

72.5 KB Created: 2021-06-07 21:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c36810c782e5f942f8d853313aec7624 SHA-1: ff85997e188403f83aabf82bb9e87fbe22f7eb48 SHA-256: 98df8691a40eb02c287ecf4b1e0dbc09367604c30d0b86fdff55f7afc65b5478
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress upload directories and other domains. The primary purpose appears to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cructi.ru/uplcv?utm_term=planeaciones+multigrado+primaria+unitaria+2019
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5b938e4a4---zuxegupevusetixipadinopi.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085b0b8d4bac---fajubono.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/0ddb5b422eeb92247dd346f5bea7ce79/sudatabetax.pdf
    • http://moristas.com/userfiles/files/pogat.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed5e7b5211---fimakapijekugojevotekoxo.pdf
    • http://akkoryazilim.com/userfiles/file/wekuzixezekokobuturozine.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091690214696---22017354335.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093311a9f50b---fonafofuzafiziroresumezed.pdf
    • http://mevlanaasm.com/resimler/files/tosewozafaboxazavijo.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/d9c3f2c96a6e2cf551015383f82b25ff/56783652611.pdf
    • https://daaeportrett.no/upload/file/72909034480.pdf
    • http://zae.me/datafiles/file/zeguniwer.pdf
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/70589342390.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607685594d63d---zinesuneku.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e13a2c521---rexelovekapixatadiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d85b.bin
cbf086365e962128e7e6058dcea12d61d44bb8797e0badadf4bb6f5ccfcec89a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD85B 5876 bytes
font_01_sfnt_off0000ec46.bin
c86a5f6dbed61195d7e3c070d19dc50eb33f15c8f7e0ba4c4f2cfa47ebaa1265		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC46 12400 bytes

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