Malicious PDF — malware analysis report

Static analysis result for SHA-256 696948b528b63e77…

MALICIOUS

PDF

77.2 KB Created: 2021-05-17 21:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: daacd10d8063ed37776cbd8538b4f466 SHA-1: 8b6e4729439df09d277baf427c2aaa37246b8c9e SHA-256: 696948b528b63e77c9e4f787ebba9ea859ab94230ef817c6f737ba78307bde9f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The document body, though heavily corrupted, contains a reference to 'chemistry equation symbols pdf', indicating a potential lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://smidgel.ru/uplcv?utm_term=chemistry+equation+symbols+pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/e22c193dfeaf9fa8834206dcc5f1f12f/mojifiwumid.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/25ab2f21afa5042862d87ea18b5e867a/judovijoxukivufujokuw.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/fb0fca3d226f2e4ea8dd642408cd7685/332363246.pdf
    • http://aaaexpressheating.com/userfiles/file/zidinodisiko.pdf
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8826eddc4---bizetinubuxapebiwukexubo.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/6c85e8146cb37b9b1f6e10a6e481a380/nupafarunex.pdf
    • http://mytmbc.org/fckimage/file/82108114157.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/fdse8r8slbdl1jb76tpcg44ofb/3702761118.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/63c932430295e081b5606999f24681ed/82319482837.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607151ccc2341---38069612994.pdf
    • http://crmrealty360degree.in/userfiles/file/lizedebugo.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3e3e3e2b1---78358917296.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/9kpbttgvetnmn9jaecinbabieh/63590178279.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160845a27c82ae---datiluzipafamab.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817fd817966---64527214345.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/63455820379.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/1262daae144f3a967c2d6e4084b8062c/tuzominozutirinigo.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f25c.bin
8675ec7df308af3b056ea70773f99f289d2be8fee812462ed706321fdc16c706		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF25C 5552 bytes
font_01_sfnt_off0001050d.bin
6eea5526f3e1825b227f51013cad6ca3f8a26b5c8441b017b74eb42e2193d330		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1050D 11428 bytes

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