Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3c482437f47cbb…

MALICIOUS

PDF

80.7 KB Created: 2021-06-11 17:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0b77f70d736bc8ee4a88c0a44837e0dd SHA-1: e6fae6beb66c1a1693a8b2df3281b2d810e7b395 SHA-256: ff3c482437f47cbbed59ef8424dd978b0df86a1d389b5be9d621e9cb0735f540
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://laborke.ru/uplcv?utm_term=minecraft+launcher+download+java PDF link annotation
    • http://studioingegneriavaragnolo.com/userfiles/files/minanuj.pdfIn PDF document text
    • http://rld-carbon.ru/file/66329332695.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97f912450---87351053103.pdfIn PDF document text
    • https://energooptima.hu/upload/File/82819983949.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/42824814657.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/irprug0coh1jv5lkjhdrgmjq7a/ralabevubobub.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/wugod.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e020cd55fd---tipakafafaxu.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d684cdef4---1003132774.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/33455893091.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0fe98b862---fuzubezapiruzosuwonu.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/3e8215fcbcbb23d021a63f48b7ab0e78/78714016817.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160764dc4cea4d---tegikibobajubow.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d3d52d115---rudupodoxadezovusewexivar.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084480d44048---vawoxiretosoroxeg.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8d105b874---56332733292.pdfIn PDF document text
    • http://amdind.com/userfiles/file/batelibubuwasaxigepudojux.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/vuzamirekukosupozekejoni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD27 4596 bytes
SHA-256: d8e9ad509048550b6a2e69f7852a26cce87caea6a7ccdb7c2fa8d91badd925a1
font_01_sfnt_off0000ed65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED65 5044 bytes
SHA-256: a6d4e9cb2e516ce765bf11e0e9f190cf5c8dd8caaf5c0680fc2e307aef3af2a2
font_02_sfnt_off0000fe92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE92 11604 bytes
SHA-256: 6fe83513d9856ce50469a41fd03cdf4ab516c65f450c73282f7b090f5a589909
font_03_sfnt_off0001259f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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