Malicious PDF — malware analysis report

Static analysis result for SHA-256 874f43227f05d526…

MALICIOUS

PDF

73.5 KB Created: 2021-06-21 08:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 523aa1cc5007884c2d40210eca19a22d SHA-1: 67361f6cd020725ec0496cacce6428160254c955 SHA-256: 874f43227f05d5260ab1dc94f0bce88eda1bada2497f1353f2624a5b5b9874a4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/116aac5d619f47279e4e5f0107d9616d/sugegowab.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/saxuvoze.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/813e7ca05e94e9b3c2900448bf7efcdf/fonesimemipudowewomijadix.pdf
    • http://smn68.com/clients/75339/File/tewefu.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/f3ncruant30cvrn1l1a0v9840r/58025219903.pdf
    • http://akekaluck.com/ckfinder/userfiles/files/salutabugemuxasexebikelew.pdf
    • http://market-oborudovanie.ru/upload/file/vujaboxezu.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/df3b65aef9ea288aef0ebf6fc81d2ba9/jitixanuwukax.pdf
    • https://dianthusindustrial.com/resimler/files/vodepevizuxuso.pdf
    • http://pappteam.hu/userfiles/file/23519356086.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/laah3qpoddhhcd6cksj205e4pk/10077563840.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac70bade08---69944975356.pdf
    • https://acgroupenterprise.com/userfiles/file/mixetusixefodipapu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=sheikh+khalid+yasin+mp3
    • 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_off0000dd90.bin
a68540af140465208e6c62dda166ecf1f31b0f23e89e84737aa615ee5c0ce6e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD90 5536 bytes
font_01_sfnt_off0000f04a.bin
b4828d2082292ee07203b608d76491a7b7621e014f758dc59150df0163092d42
pdf-font-stream PDF embedded font (sfnt) at offset 0xF04A 11996 bytes