Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b11ed0c4f4cbfb3…

MALICIOUS

PDF

77.4 KB Created: 2021-09-22 11:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 48864a350e0e8846d7c437898683f664 SHA-1: 3cb87410289892d3e57a0b6587f4163f80f59509 SHA-256: 0b11ed0c4f4cbfb3a644578a24cafab801d7300aa01b3e299ee73931480dfc01
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The 'wkhtmltopdf' authoring application and the presence of numerous links with UTM parameters indicate a campaign focused on SEO poisoning or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://infrive.ru/uplcv?utm_term=advanced+english+grammar+a+linguistic+approach+pdf PDF link annotation
    • http://chemicalengineers.ie/images/wudatuzizexifowo.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/magodojadezikutapobowe.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/1137583519.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/ab644832d468c8ce2a44c2dac009ec83/xojogeliwezobalopa.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/80293551879.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613190e37c120---mitobikakurebaxunulovago.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/xarativigepapazojadaw.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/47343453046.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/zifanalibuwonuke.pdfIn PDF document text
    • https://cargotavio.ru/files/file/faroki.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f6e665a76---29942350689.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/61475199945.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/nawasapalirotorasulonij.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/84649853313.pdfIn PDF document text
    • http://kbchina.de/upload/12510323114.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/78761579670.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/nuvalesifokinonefexo.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/kifinoteg.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614adf1dd1b01---xezusujikurivafunalu.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/taselojewene.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/9567961263.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wepapigunufefi.pdfIn PDF document text
    • 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_off0000cc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC00 16540 bytes
SHA-256: 25f235599fc1a9011f35b1ff6acf1c462246c831c3d4d31ba3adfd19ae8274a2
font_01_sfnt_off0000f5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBB 11212 bytes
SHA-256: 05946714e6dbab1b75da492c8e79b95d00dc3b378ad8df45aab22ac2ca2adb15

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