Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7bddb1a0654daa…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 00:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 83eaa29ae861a391e42a8ebf58002559 SHA-1: dd0b4c1e6a85f5bb76d8d25b16ab45eae4445934 SHA-256: ff7bddb1a0654daae254ec4766b39c2d5c5dcbe9524b53218e6f4ab9fa3f6f2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://infrive.ru/uplcv?utm_term=critical+care+nursing+a+holistic+approach+pdf PDF link annotation
    • http://flomojapan.com/upload/files/ginavedopuposexite.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/23351318498.pdfIn PDF document text
    • http://techbis.pl/files/file/lotufofitegasikepux.pdfIn PDF document text
    • http://yongqingtech.com/d/files/85501499100.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607109f3ad904---mubobexanerejoluzuw.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/nfop36hocoo2hhd9udbce0qmk5/lixibojogod.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/korefogajenavexuvakusejil.pdfIn PDF document text
    • https://blugarden.eu/file/85893707357.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/m7dknkmu9kr9g6l5370m6es9pj/65417957671.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/72177173755.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/jv7u7932n62o5903m7arl03j02/39662339289.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c34a163c704---88600630976.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16075a8f64b23c---90200547176.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/paxirosezase.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/435e02cedcbb955ebb4e61e4fce399da/23839033259.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/zunididetalinadenaziji.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a56f254eeb---91782888761.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/22449890868.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/83ab3d5bc4e0e39ae08a7d75caa161c6/lenipufuxuboderedow.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b18af87583c---vujomexufi.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/dopoxavuvibi.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d6e0a9be6---82075504003.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_off0000da27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA27 11028 bytes
SHA-256: 3fc254417c1c355d342f0cea25059e7a4d54988244608ff40d608338274d82d2
font_01_sfnt_off0000f389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF389 17216 bytes
SHA-256: b846d730b2ca9195106cf0ffe287f1a7ca8db7d4ef99eee6d3033fb3c66b17d9
font_02_sfnt_off00012085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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