Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd6a01129bbfc09…

MALICIOUS

PDF

70.0 KB Created: 2021-09-18 19:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b10040e16559d13df834852b093e5e39 SHA-1: ad710da7b595d3041f6ec601fa77003acbfbf828 SHA-256: abd6a01129bbfc09963a5d9387eb18b2f25067509b763e276e4987234f38555e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. These links are likely intended to redirect users to malicious sites for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. 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 https://coretry.ru/uplcv?utm_term=upload+audio+file+to+server+android PDF link annotation
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/85e9ee63edfb145830f42a9d336bd774/tevibekorawamosozifiwabep.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/wosak.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/17073549250.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/80164148779.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/buzikiraxibesopimikopa.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/54057632264.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/bavuxo.pdfIn PDF document text
    • http://pk.mo/userfiles/file/mikajelof.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/54685889564.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/96605922779.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/vulizan.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/mefenududerodajamalas.pdfIn PDF document text
    • https://wittnebel.dk/file/linadesukixumuj.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7625899e3f3758de8aa6afb62056de94/38548837159.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/b79afc4ee009ff7cb1d41771ccf0099b/kariwimotele.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614305bb28906---xafodumano.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/11388073936.pdfIn PDF document text
    • http://myphamasia.net/upload/files/nakuwinumugomunije.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/33048046268.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/16496824741.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613927a86c934---76101662791.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/231992413.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/vopabalaxetirupuwaxaza.pdfIn PDF document text
    • http://hangquangauto.com/files/11075031500.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/58621713579.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_off0000b425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB425 15028 bytes
SHA-256: d64091890155a893a4401189f2b0e410c19618e681473768995d4e62480b6678
font_01_sfnt_off0000da03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA03 10664 bytes
SHA-256: 87588e9a6e66f304a1bf880d304b1362d012963e5b746884d1591597c103606d
font_02_sfnt_off0000f295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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