Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2514479a287c195…

MALICIOUS

PDF

62.3 KB Created: 2021-09-22 15:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 83846b55c90ec2484fc4646dad2addc1 SHA-1: b5899ed2e6c234d5e334e7161183014f1fab179a SHA-256: f2514479a287c195a636ef7462489556f57a5fe1f58f7cb7066255a024ac6360
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It contains a link farm pointing to various URLs, some hosted on compromised CMS platforms, suggesting an attempt to distribute malware or phishing content. The presence of external URIs and link farms indicates a likely attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5468

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://krisoc.ru/uplcv?utm_term=mini+militia+old+apk+download PDF link annotation
    • http://wernitznigg.at/files/39859319934.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/dadifozeluwomuz.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8e0b744e7---35409495531.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/29pf4inqeqem8e2aj7j07vfpi1/20159936446.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/jovubo.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/59630389436.pdfIn PDF document text
    • http://iccarrentals.com/files/file/ligofomiteleva.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/24422061899.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/68713619484.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/badaladixawa.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/xabex.pdfIn PDF document text
    • http://iphysiology.ru/upload/26581828868.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/86ngdp21jjkh9dhc5n6jkihji4/muwenotipifos.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/93044065741.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/malifekapulitowogetiwiso.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/64714085877.pdfIn PDF document text
    • https://invest.pl/userfiles/file/37254730925.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/gopovalojudepewumidu.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/donuturobipigexokup.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/88417796918.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/8322944627.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/64077682494.pdfIn PDF document text
    • http://chineseclothingonline.net/File/2386200509.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/87487069169.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210918022450.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4E 10324 bytes
SHA-256: e926d70204ee19afa09e2a88576b5bd36a97f55ae009183031846447130588d0
font_01_sfnt_off0000e189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1