Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e623a59717c3211…

MALICIOUS

PDF

89.7 KB Created: 2021-09-11 05:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 552ee1458bb51504b088971039057dd5 SHA-1: 3f41dbc67110dfcfb3977ca383400c60102ba975 SHA-256: 8e623a59717c321164f261e3ec68578796c6e88231972cfdc4a0292605d64fdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to various PDF files hosted on different domains, some of which are identified as compromised CMS uploads. The presence of external URIs and a link farm suggests an attempt to direct users to malicious content or downloads, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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
  • 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://polesprogettazioni.com/userfiles/files/7137547241.pdf In PDF document text
    • http://mottaing.eu/userfiles/files/genosuk.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613791faa6298---wuxirewuxuvinuwu.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/24078326974.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/98995292730.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/14966623196.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/fb5448d42fa29b889c43e4873b54447d/44569767626.pdfIn PDF document text
    • https://windsbs.biz/files/file/jepeme.pdfIn PDF document text
    • http://oilspecchem.com/files/63606886708.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9d14d0a25---betutubur.pdfIn PDF document text
    • https://satesayap.com/contents/files/48800704397.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e0f4a20ef---teramugawajo.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/21090201535591321572yi3.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/pevimomokonowoxubugutef.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/62545d53655447fd599e45cb54b531c9/69086938819.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/mevepofajo.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/mawur.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/27735654891.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/28441283165.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/kikunobomudowunegitazokof.pdfIn PDF document text
    • http://citty.org/images/uploads/file/tetibowadetomejananuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=call+of+duty+black+ops+apk+free+downloadPDF 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_off0000f2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BB 11084 bytes
SHA-256: f0f0b9afa7a76a16772f04f03c7344fc91553ce27571a86d3863f14266b8f2e9
font_01_sfnt_off00010caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAA 20028 bytes
SHA-256: d10052ffa72f3b6f4d17e006bc3d86a808ea0f0559a9752b940825786f5b1dba
font_02_sfnt_off000140c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1