Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6239a1d5500a2e5…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 06:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5ffeaa0845df2b384cdfff1f4db51fb2 SHA-1: 4cc239211b3c46512916cd4d3ef8054242392e21 SHA-256: d6239a1d5500a2e5a2ecf250b9a8e7b069bd79fc7f5e5333cb7564329949a5b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Heuristics indicate it's a link farm pointing to compromised upload storage and disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, likely involving phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://ekogamma.pl/javascript/ckfinder/userfiles/files/pilovipokevizubajijilapaf.pdf In PDF document text
    • http://traviet36.com/upload/files/53055888573.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/b13315e70da36a94386ca776f835ba8f/92960300416.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/xitujoto.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161394363b64c8---43271542115.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/371844628.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/74279668122.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/27100823831.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/94462119792.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136dc5596b98---8271091173.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/7697334348.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/24961526282.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/wafobitisirefef.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f70ca6d20---35696782185.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/nutuzujogose.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/27470620603.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130ac438d0cc---42114790945.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/gulotopezimunixuvodorop.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210908130753.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/nupagofesowi.pdfIn PDF document text
    • https://shibbirs.com/media/files/javuzufazatekopewu.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/suvofotibu.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/12888580469.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/44295763578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=best+group+games+on+phonePDF link annotation
    • 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_off0000d963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 18392 bytes
SHA-256: d5a5737d0cdfd66c05c17b4b4e81330e6b053f43669dddb1bc02ba20101afb19
font_02_sfnt_off0001207e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207E 10712 bytes
SHA-256: 5e0ce040a9bde9a26742b682c1e4abd617bd87d5c28e26c28cad5cae50a478db

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