Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87d19454cf01182…

MALICIOUS

PDF

68.6 KB Created: 2021-09-26 23:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9cae6aa571fcd8efdbf709b0d0d5e6b5 SHA-1: fc85fa328ae7630593f58ab83cb439d621e6846a SHA-256: f87d19454cf01182569fb0637cf34e8d1d3f21a4d3f455a1361d0d93e6bd6b2d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://pixomot.ru/uplcv?utm_term=cinema+paw+patrol PDF link annotation
    • http://baloneacessorios.com/_upload/file///temopinosimupiwuzuf.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/27968203373.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/zutafijovulefolavuvimud.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/26195351289.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/bea759e389e38f22c5e02b4ef6ba2e89/jetesexadelemiw.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/fubawazalexo.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/jodibodarofoj.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/lelexaviwidozowimix.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/babusi.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/19205553401.pdfIn PDF document text
    • http://catwalkexotique.com/userfiles/81189459482.pdfIn PDF document text
    • http://wamer.org/userfiles/file/49441897285.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/ratimegugokajoxu.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/sotatumenasaxubi.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210904173129.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/6cb8e12cb0b5a542c3535153a3c12799/26709459666.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145bedde2952---22948161086.pdfIn PDF document text
    • https://ratoempat.com/contents/files/wizonuk.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/11597902081.pdfIn PDF document text
    • http://akcco.com/userData/board/file/vunaravijovinufitig.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/80282698958.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_off0000ae9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9F 15344 bytes
SHA-256: 18849dbceda05ca9f76b90d800c59d9c263e1d3c129f45c9a393f5e0bd75006c
font_01_sfnt_off0000d5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 10364 bytes
SHA-256: e3a07fe265fdad92f3ffe543447e89ca6b5dc6efb7e6171d2d81bb4054937ca2