Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b026a3066690dd9…

MALICIOUS

PDF

113.8 KB Created: 2021-06-21 10:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8f3027b236ed1a97f740f84d4651324f SHA-1: 596f27951045ff04fa82f690b6f257f9bf64ad7b SHA-256: 4b026a3066690dd97df6751d82f284e5b01e5437e014edcb1c0148e03aea1a81
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various compromised WordPress sites and disposable hosting domains, likely to distribute further malware or phishing content. The presence of external URIs and link farms suggests an attempt to disguise malicious downloads as legitimate resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9402

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 https://laborke.ru/uplcv?utm_term=urdu+pedagogy+for+ctet+pdf PDF link annotation
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/basamibotujiwulaw.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/xuwabomoberojiwivuruju.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53920ec1b9---38312906719.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/19751558185.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160821d832762a---58527344424.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd5c51e13d---75482357526.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/9d49099d642c2d90bb789f47052ac90e/tijutemakixijawokikajol.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/zimimuregovasim.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/pv8lefgbrqk2p2e3lkobss5h0d/89686805294.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878b3ef250a---11342708837.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/55h2a0k91ac0lerfnnp18uqf2j/zepawu.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/bdca7b469ed0dcbbb60293c7abbe8c19/7722131132.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/pojenosiwafevubadegom.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/01a12bab1910b85cfff74fd460a028ed/fugunudagabizir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16339 6832 bytes
SHA-256: c94f7bf2ddcbc1bc3fd692f064b1ae9aebb787ad29d603738cab9d3ac92d0e0c
font_01_sfnt_off00017458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17458 10444 bytes
SHA-256: 71882bba0bb71b11982e91514c9072f1968adeeaf184473826973ac17cdbadde
font_02_sfnt_off000196d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196D4 5208 bytes
SHA-256: 9b92415b51110a0023d95569ff5ca36ddfa8ade083876172f56be3f07afced97

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