Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d9fcf41361e172…

MALICIOUS

PDF

79.9 KB Created: 2021-09-08 14:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c7d5b566c4c2ad29eee2cf63ee4d759 SHA-1: b87d66b405ff067b42ee9f4360212c68ea14c0a5 SHA-256: d4d9fcf41361e172b613800de43217c18f515aa7e7b5bd360dfb221338807309
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to compromised CMS upload directories or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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
  • 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://pixomot.ru/uplcv?utm_term=python+fpdf+multicell PDF link annotation
    • https://ferropula.hr/files/36120097494.pdfIn PDF document text
    • http://www.pvvc.cz/files/fegamojorakudowemakobemoj.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2c2020bf2ea87ad7181035059b513877/pumobunusawoja.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/90978321519.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/95708725527.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/likabimawuvefibuge.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/40e41b3fb52df1bd64c6d689752c42bf/vorix.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210906181029.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/bulaxiwodevegudu.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/20025634417.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373ac74636e---63720337165.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/jizovigubezegalojezid.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/fiwenodi.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/migomigaganuvobuxi.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/tuwabogomopewumevirosej.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/winabezikavurarolosud.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32332747477.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/cdd5ea8a547fecb7ee1695d7d59cdd87/53942913279.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613548cb0adfa---68154979644.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/37028906841.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/pivareresebani.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/pusakijutojivuw.pdfIn PDF document text
    • http://talesma.com/E/file/rapowasuretigixi.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/1680406361.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_off0000d1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EA 10668 bytes
SHA-256: c86838e539d6e02bb95346dd4bb570a1b33f5cd1a1215ff27a44c14cfe9833b6
font_02_sfnt_off00010223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10223 18424 bytes
SHA-256: 7e0e26bea18b5516f306ad104885db829e99a4b723ff111086a2f420363042b5

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