Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f70d1bda2ddc8b2…

MALICIOUS

PDF

87.1 KB Created: 2021-09-10 11:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9712c570643e142ccaa282b686ab89c3 SHA-1: 9e3d2bfeb16cdffa9f0fedf0e044d580c1b567db SHA-256: 2f70d1bda2ddc8b2425a3fc4777903b0bd412ae46c729abe974b38cb3b9eb7eb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that redirect to other PDF files hosted on various domains, many of which appear to be compromised or disposable. The primary purpose seems to be to obscure the ultimate destination and potentially deliver a phishing or malware payload through these indirect links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://baltic-rt.ru/ckfinder/userfiles/files/32499610215.pdf In PDF document text
    • http://bijverhoeven.nl/uploads/files/26828115788.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161305c80e6c11---wosabaruxojoraru.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/kitenavi.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109080247058293.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/daposinanevawesufujotov.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/mesem.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/7058235094.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/e39bd75a57a34b848e88096873c4deaf/10715155428.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/86162327309.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/97082249741.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/76836878280.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/92943318602.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/71550908808.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/84769037521.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139147247ebe---55131747127.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/67133159773.pdfIn PDF document text
    • https://pokereshop.cz/data/file/bekivaxofuxelijazidino.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/pavofuwa.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/57skncgij1v2h0sunmset7t894/67819481535.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/kanovatexuwunav.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/dajaxagebinokemoxe.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/fug6r2b6ibseblu19dsalenjn3/susododase.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/66101866425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=t+mobile+tuesday+app+for+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85B 17084 bytes
SHA-256: 4790d2f20617ebf4a1c222df3aebf93dfb3a5e3c9d5b5a5bfa51b8b859256348
font_01_sfnt_off00010484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10484 10976 bytes
SHA-256: 51a717baac1d3b3cec6b51f978000a74c073e2b0af419f05c2103002efcfa48d
font_02_sfnt_off00011dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000135d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D9 17004 bytes
SHA-256: 1433fded29aae041a3fd2a7c201252c8006738d9b88bdf90fb1975ecd3ac5d65

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