Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6bb1062ec64e22d…

MALICIOUS

PDF

87.9 KB Created: 2021-09-22 10:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c63b630223083a151fcac78c4c7168cf SHA-1: 3cb68ff3d73637fac55f02e1462db0738f6f833d SHA-256: d6bb1062ec64e22d0aa74b8e496f36af30c2763c3bb670802df405dd7c029944
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, many pointing to disposable or potentially compromised hosting, strongly suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nieruchomoscikomercyjne.co/files/file/werekojazuburisimemerave.pdf In PDF document text
    • http://ukkies.be/userfiles/file/talejenupulumimaketebupu.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/92133793079.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/rapenufidika.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/92186643700.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/32218984349.pdfIn PDF document text
    • http://schokofontaenen.de/idata/nidiwukijonakalavu.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/76533695339.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/47757780288.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/34422513882.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/24tvnjv3ci5gml479va05kslr8/74967929536.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/6jq7sb805kn723dbhqi85fudfl/xabofebarigokomavezisat.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/25464970879.pdfIn PDF document text
    • http://boki.hu/editor_up/13299828469.pdfIn PDF document text
    • https://www.renouer-auxerre.com/ckfinder/userfiles/files/xulufoditu.pdfIn PDF document text
    • http://stefani.cz/fck/file/82875276598.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9065a3a61---15276399516.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/zejefu.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/b538d3ab57d948aca52ce637f3312fd8/bofuzagotabuvufogepad.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/96818117163.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/41164705081.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/tuwax.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/89913038969.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/5373013228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+lion+king+full+movie+in+tamil+download+in+isaiminiPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE9 11008 bytes
SHA-256: fa06b0b19fac49357f93f4559a22161d75ce319c30b4516762090a092837db53
font_01_sfnt_off00010934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10934 18628 bytes
SHA-256: 7401fe0af1dd9669aeb583eb77564d481db1cfe9dd7b252b5a191e6ba656c328
font_02_sfnt_off000139cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1