Malicious PDF — malware analysis report

Static analysis result for SHA-256 4898f86d7e0e576e…

MALICIOUS

PDF

83.4 KB Created: 2021-09-06 12:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b5787bc432c1cbb118362aed714b4cb1 SHA-1: 9f20431998de40debd353ba175926a0e1b44f5b9 SHA-256: 4898f86d7e0e576ea0a9d8b6357ba3982369f9d6a3c17ebbe062f72929a39b3a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The primary attack pattern involves luring users through a malicious attachment to these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6273

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=torna+surriento+pdf PDF link annotation
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a9a04a19e---zubofudakifuzado.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/zurexamejojepatezejogoru.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/vuwenedilubupib.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/pakipeduza.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee066fcad---gabivotogo.pdfIn PDF document text
    • https://polandpools.com/contents/files/witekosusofataf.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/16931178396.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/kq5sq85q7lgv4kt1mbak38rfue/41444881813.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160bd31ca11981---48274535456.pdfIn PDF document text
    • http://ashioke.com/images/library/File/1420910780.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/009f98f7bb644458ad7d71346fe0c4a3/72859440374.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/netidozudusevabetirimegor.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/suvezofomo.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/85605819957.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/nukibalakebesudesas.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/remasemokirusivipenev.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/75760136751.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/20217242320463134.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/a2c814cb27b983993ed8569c402e641b/musizesisewavi.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/madowaj.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/zisubagejokujurupozodani.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/24361884482.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/mokotimumirifulezoxuzaw.pdfIn 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_off0000f5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAF 1868 bytes
SHA-256: b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8
font_02_sfnt_off00011667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11667 10508 bytes
SHA-256: 5f346e3c1c79e191d3bea08eae0c22cd9d33436924a2f938bb201022ac7f93d5

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