Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6f4196ff01cf2e…

MALICIOUS

PDF

89.8 KB Created: 2021-08-01 05:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 99547d1c693cc385c7074e1a49e7a56b SHA-1: b88f94fdcc2a4a947d227dd7b252f17fa857d0ce SHA-256: bd6f4196ff01cf2edb69f5bc936a579c7a85f26774d4d5559378a04ec4415de9
164 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple heuristics related to link farms and compromised CMS uploads suggests the PDF is designed to redirect users to malicious content. The document body, though heavily obfuscated, originates from wkhtmltopdf, a tool often used to generate PDFs from web content, further supporting the idea that this PDF acts as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ahdongjiu.com/upload_fck/file/2021-5-1/20210501005120392120.pdf In PDF document text
    • http://jyotiacademicpress.org/uploads/file/15288753593.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/gexuxojigevufug.pdfIn PDF document text
    • http://sam-global.ch/files/file/66054675030.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/sodax.pdfIn PDF document text
    • http://slsnn.ru/content/files/gufuj.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/16bdf28aded9d35476db3c0bb8d2e639/winebaderawebo.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4730268c5e945f20ad4e4d3f07357aca/lixufogavo.pdfIn PDF document text
    • https://assistenza-termica.it/file/15637415567.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/9257a7bb319da065b3c796a1321785a4/mipigoxirilomunomomefoj.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/25295338836.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/bbuuu40lqhk6dm2lmje5r8en97/fasilomifovobato.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/c52352b30bec9876e9a08acaa53178ca/tiveparezivabe.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16076c979c895a---tufeke.pdfIn PDF document text
    • http://masonfamilyreunion.org/clients/b/bd/bdaf0a3c19eb5f10f0519c747c117e37/File/wepiselajotewugiveteruwak.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/od38nj1bojnomj4l3urrrmng79/43026201620.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/ponugasiv.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/xidugobu.pdfIn PDF document text
    • https://jurad.eu/files/file/72026200564.pdfIn PDF document text
    • http://2021woods.com/clients/b/b0/b0e6999751250b7f6f06d89f33415bdd/File/foredogeresovelakifu.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/40995712213.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1084607145---36807515023.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/47529386927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=download+buku+biologi+campbell+bahasa+indonesia+pdfPDF 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_off0000f716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF716 11288 bytes
SHA-256: 641ac30ccdeffae01f1646bb24eee047ce82419678b67b37f701afcddc6b8986
font_01_sfnt_off00011104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12916 17180 bytes
SHA-256: 93aa3f9dd4e1661777de0231a3a9943f48beea2597c47583fd231084a2c5671b

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