Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1e715e652d8157…

MALICIOUS

PDF

72.1 KB Created: 2021-05-10 00:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3104c727991601d0d9ff450c74b23649 SHA-1: 5747e9ec440f4cd750b66e21a22f4ae6b4f574a1 SHA-256: 5e1e715e652d81576ed0665bebefe4a1150c796f1189aca8ae5c63ef8aaf256d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608873ea14736---77308254732.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/qiv60otoitd1aecari1tunb0j6/xagovi.pdf
    • https://latework.cz/soubory/43828094238.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/07a66992671a94c0402cd663ae192a9c/71398218798.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/c3tqnqgah4u0o3nciqefio57lp/54043628461.pdf
    • http://lapenya.cat/imgjovesnaves/file/41930823329.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608db6707051a---88954051134.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160780d27f416f---luzevapom.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a6c9221b479a7dbacec634cfab4c1914/31025677484.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf839b5127---muzomaj.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/3390275f1199116dac8fe24c532aaded/68483618756.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160857aea1a2cc---xiraseneb.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/9b3c0db13a5a88b389eaad125520b01f/9042354005.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/l5s0qrqibh0dthq5bad013r859/nawixexajegezekawemujita.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=1080p+60fps+test+video
    • 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_off0000d5bc.bin
5138df85710bf390f0b0460b1a442f3bafb2d0dae265897fb1593bed1e722825		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BC 5204 bytes
font_01_sfnt_off0000e79a.bin
0ca3108ec0c0a5b39dd9c94e9246fc658efe80e9cfcab37f39bb212a47fe07a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE79A 14960 bytes

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