Malicious PDF — malware analysis report

Static analysis result for SHA-256 181f307424e65697…

MALICIOUS

PDF

78.9 KB Created: 2021-06-18 19:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 02bef1b808d3cfb66c110b3aa3a8a342 SHA-1: bf46ffaab00f17fc5965e21c87e308ffc536aa12 SHA-256: 181f307424e6569770dc77ebe8778709d3dc39cafa44852d21788a7bdaaf9e0b
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external websites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document's content is obfuscated, but the presence of external URIs and the 'link farm' heuristics strongly suggest it is part of a phishing campaign, likely attempting to trick users into downloading further malware.

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://medvor.ru/uplcv?utm_term=barnett+whitetail+hunter+str+owners+manual PDF link annotation
    • http://simonide.org/userfiles/file/xumuzewajawikivobofu.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/gevajozabexatuj.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/c4eedead8ecca87793708be78a432069/wunik.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/28372896864.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/59403069174.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6af09d5d91---magaripesudirabidaguwite.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/24351631187.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/nugij.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/xuvibawet.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6394b9847f---wunebugifefarumozol.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9e4519904---vapupubixusadesowexinuxi.pdfIn PDF document text
    • https://tipresentoio.it/images/file/kavigeketuxivujovavakevid.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/garivaluga.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/58bc03c2b9557ed15a0ac167be66bc3b/82118929591.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160999b6fc8d2d---kawuvebul.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/busixanoxefuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69F 5064 bytes
SHA-256: 454a4bced49405e7c70d2f3225f020acd5a119b937fcaa5c4936bcf60319876d
font_01_sfnt_off000107bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BD 11240 bytes
SHA-256: 304f10cc94cc1842676ddb72ee4cc318a18c9fb620959653fd80ef9e255a36b8