Malicious PDF — malware analysis report

Static analysis result for SHA-256 402f624b49dd2c63…

MALICIOUS

PDF

76.8 KB Created: 2021-09-23 22:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9ad961e4b5aad1e1603e8527c09ea5a4 SHA-1: 16b86414e5bbb3f4943b4aeae0e535b179942c03 SHA-256: 402f624b49dd2c63b0f91b6c870d9044137d731b39b1a4ff5fcc0bf413e2bbed
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure itself appears to be a link farm, designed to obscure the ultimate destination of the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=how+to+merge+pdf+in+android PDF link annotation
    • http://aeusjtu.pretty-match.com/upload/files/jibajodimed.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419df839cef---rewuzonefo.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161488e22df95a---sewaxatutemanilixubiti.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/60526273542.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/343b4be0b562aff6f2f10862a4a5b40e/dazugojilarawijibupefi.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/danisokufomurivatuxumas.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/befobubuj.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/toloxefalakawokixuba.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/88431722356.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/dupegofetafi.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021091110522240.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/zenup.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/64527209872.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/42727078421.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/3cb232297d022ed95dc16d9a11f4493a/pirugixujajilawipejovuma.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210914_4D0E4B541914C507.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/dorodama.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/61696633069.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/danovuvotuganuzilemu.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/zepuxunozokofato.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/xuvadage.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/rutimafudisesiwolewefavux.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/81603761025.pdfIn PDF document text
    • http://vejwun.cz/images/fexemezogewebi.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/ribapowi.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_off0000cbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDA 15920 bytes
SHA-256: 106dd8e28d09a9656cf292190f5984705bd7e8ae04c76ce18d3589c2dd6ba971
font_01_sfnt_off0000f4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF3 10704 bytes
SHA-256: ae6a7aa12ae5f7ebd8b56c90f662f0bfbd9d0b507f31cbefc2dec8bd77535efb

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