Malicious PDF — malware analysis report

Static analysis result for SHA-256 23becc6c631999bf…

MALICIOUS

PDF

64.0 KB Created: 2021-09-21 21:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 24553dcfbe271250553cf536ac6aa28f SHA-1: bead78c62cb3ff39647b6775439236ee7964eb0f SHA-256: 23becc6c631999bfb60df10a0fcef76eec240574e399e178227e42595e8900bd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier flagging strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7095

Heuristics 5

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=setup+exchange+activesync+android PDF link annotation
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/2520172d57c1c5a6566264db2b1dbece/milonafavivewuvexabez.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/65516100224.pdfIn PDF document text
    • https://norservis.cz/files/files/6373769132.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/5663840077.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/48822611954.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/75749947342.pdfIn PDF document text
    • https://doitoutdoorz.com/file/nwnRY1Sab2NcJwDn.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/56010537626.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161304f57565b5---lubenanoxo.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/78453366135.pdfIn PDF document text
    • https://promise-land.com/upload/file/moxisibavepawilivujizogu.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/rulalajakimebolufizutaror.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/52716630938.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/51186988401.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/wirunirugajuv.pdfIn PDF document text
    • https://ferropula.hr/files/kurivawi.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20219915971250.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ithrlnosr1rif5ghhhe8f5h2f5/33485994907.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/52320288710.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/28622676465.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109070542408407.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/mupijakepuva.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614a0f84544ea---15565327280.pdfIn PDF document text
    • https://fuoriscena.eu/file/33521072265.pdfIn PDF document text
    • https://nppmaudaha.in/ckfinder/userfiles/files/27062574561.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7A 11204 bytes
SHA-256: ac480419b83e7c8ad32bf309f1854d5507bdc78c9bc866dfa39fd936ede9ff49

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