Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ef5be60929bff9…

MALICIOUS

PDF

94.4 KB Created: 2021-09-16 00:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b791ffad50817d0a5f97786bf914c01 SHA-1: 2d9305f9972290f5069308854599aedb733c8d0c SHA-256: f8ef5be60929bff9ddf408798f767b4942f8a2bf2ab96c4f7051586ddca834e8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 http://industrialdevices.in/uploads/66989510479.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da8049c1ca---11238203187.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/88262480443.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/32761569523.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba869a9c8---39330805040.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/supowo.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/golidozejopile.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0f3d0704e6e7505ab6bd07165ce74a03/zejunuvosexozuxijap.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210911_FEE480CAE3343399.pdfIn PDF document text
    • http://clerus.hu/files/file/43822132453.pdfIn PDF document text
    • http://huefpdf.org/upload/file/39048453228.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/11748912381.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/50443421560.pdfIn PDF document text
    • https://motoralbini.it/files/file/49959323171.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/ditezekeluko.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210908032654.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f32a2b214b---bizevulepulekinuwapuj.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/63005476710.pdfIn PDF document text
    • http://puisan.ru/uploads/file/65989489924.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/voweru.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/gawuwebovupaforeregulu.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/57692633826.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139ed412fe6d---motiwudejomuxopobewetele.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/lalewawujul.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/92541394121.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/naxovevedodukip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=luciferian+bible+pdf+downloadPDF 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_off00010598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10598 10628 bytes
SHA-256: 78e80c486b8fa5d8fe75f93dac5891176fe07517cdce4d1fa9d9c650aa7a9212
font_01_sfnt_off00011dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCF 20844 bytes
SHA-256: 16cdd31af12bc43240db42ed046645cbe4c369b589f054d7fdb32f0e20bcb04e
font_02_sfnt_off000153e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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