Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4528e255f56244…

MALICIOUS

PDF

55.4 KB Created: 2021-09-16 01:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ca6dc0d9072fd4884ff1e0eaa350df10 SHA-1: 67d4fe8793af9c2788237d3b1080f3427452fd8e SHA-256: dd4528e255f5624483db11c17a8af8c5b4527f25c4aaeff24b433fea799d3b3e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5046

Heuristics 5

  • 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
  • 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://topbondtape.com/uploadss/file/rulibapowoxem.pdf In PDF document text
    • http://syuncyoku.jp/upload/file/goruzefure.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/51022076358.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/jaxufanafokelerafer.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/t3u8hv8dcpvrti543t93k96b40/gaxexabenidiwopuduju.pdfIn PDF document text
    • https://alpinashop.bg/files/xozugogenerom.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/witejejeka.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/juzebimukidutabosovozi.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/sidevivun.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/puzomuruz.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/56771155672.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/borurobiz.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/tipilebaramonunaretibarop.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/39395071755.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/4418590208.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/93858873596.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/52299751822.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/dirizexolorigukudenam.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/88458408539.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142693d1d5d5---14597189164.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/gaxezitolufo.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/jonitubagujagazij.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/28845840954.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/2b6edebcad4ed38631477d64cc285faa/wodosopopuborap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=a+positive+word+that+begins+with+the+letter+rPDF link annotation

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