Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f88f82f2cf434fd…

MALICIOUS

PDF

74.6 KB Created: 2021-06-24 22:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 477df1a05ea8cfcda1ca5e3f4956b477 SHA-1: fca78cd10697cdf9a898617f1b7ab78620decb8b SHA-256: 4f88f82f2cf434fd77d27bf7abfcf48e505d5c5f2afe5116b555f21d66d38fd3
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The document body is heavily obfuscated, but the presence of URLs and heuristic firings indicate an attempt to redirect the user to potentially malicious content.

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://plentis.eu/ckfinder/userfiles/files/sefaker.pdf In PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/d9225bc6c7c0ea2ed4ed58f5b01a475a/16739781390.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/xogowivomudorokisiw.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/malowuradix.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/79788211579.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/0b47038c54aafa5db5941478b863e2c7/kudimegekotadozono.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d3b7deffa---judutevokuzanozorove.pdfIn PDF document text
    • http://jar-ted.pl/file/68662026926.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/nedeberomoxonezeginovox.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/7135949116.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/85835227397.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/kexesukexajulifimimizodu.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4f86d99fc---sevaxuweturevanor.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/53804987394.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/Om9ozkHLxGw/uplcv?utm_term=omron+hbf+400+manualPDF link annotation
    • 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_off0000e4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A4 5224 bytes
SHA-256: 163d98f509fa35a2d4d9d1b8a4f0b419aeec9ca82a7ff5b95d328ae7df654d47
font_01_sfnt_off0000f640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF640 11664 bytes
SHA-256: d68439d891fc82d5298b030f7c608fbefa8d643449815fd8c572c258f4217aec

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