Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd82f1270595e4ea…

MALICIOUS

PDF

136.9 KB Created: 2021-06-20 03:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 56c61cf9d581d76c6c05d7b2f1882a7e SHA-1: fa8b63cf14bfb950fe31799eefb63cd324361164 SHA-256: cd82f1270595e4eaa6e491779356e860a922af96ebcde6a568844bb4cdc5c613
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating it's a phishing or trojan PDF. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://kotolantopeni.cz/file/51886640090.pdf In PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/l8jn0tm1cvebtpq6q6uvovvg01/5806339446.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/jkodlmtv617jj711sp5ob8itnp/40504308408.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d24a48e90c---94392487243.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/wufugarinaguwuwadetefom.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/7f3c211ed958a71191150db7e6b1c80d/rawedidoxabo.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/41233594100.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e78c6223b---17951006878.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/905bdffadc27c431a58889edf22c3e31/46149121967.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85b0ba61a3---nitajilelibugirukotopo.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a61cfe45943---jodebilidi.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adb3c9583eb---tusatexufufafogekod.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/wivaguwoloperofijaxalanag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=el+psicoanalisis+despues+de+freudPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/20070049243.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D411 5108 bytes
SHA-256: 27b60a0637a1a535e90eaa91b361117b73e154676bd43a4831f2981d8f6ef755
font_01_sfnt_off0001e584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E584 15192 bytes
SHA-256: 743c8a893b5b9bdc6343057006e88f6e01f704043dfc5b961a8d422a384d7780

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