Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2ed59ecdd506e3…

MALICIOUS

PDF

91.3 KB Created: 2021-06-29 16:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6346a0c722d15bc09b4fd934aac8e486 SHA-1: 9043d10da2f75ae55b8654430ad7fca55118de51 SHA-256: 7a2ed59ecdd506e3d54f4d98da3cb2de457116b1fe7abe2bc47135b60229e4e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, further supporting the phishing or malicious redirection intent. No scripts were extracted, but the overall structure and URL targets point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://irlanc.ru/uplcv?utm_term=dragon+slayer+fairy+tail+characters PDF link annotation
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb55a58853---repavizage.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2637cfb14---bukeb.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/sebozutisiregobufaxo.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bad99e1500---godeduwosatijoroxiz.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/neludolodesobunabubosa.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/i1kub30th35f76pkt50mqn18j3/78163440393.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/85821424452.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/dubakig.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/3bed6ac8b7ee00922154547c346eae4c/fuzara.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/60726944662.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/3uv46ieavg8sj0bh6369s1p1se/46633606279.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076d907a3bd2---duzugi.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///70389212817.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be56ff7f7ae---45252818265.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/jldf61f1so80qn7rqe71qqal49/66035948396.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/f2aaf766b4c59ffa40d0b0df0922af92/17664564401.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/pijikopitasobutexusova.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087e0a8406d2---tuxodolewoturepadotovi.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/mnunoi7a5h93chh5607q5fbk9h/82837105459.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c1d2673c6---81089961867.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/wedopisefafuwiliserovubug.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/62044167210.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/26522562755.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/13be86f1a3eefcf729f24fd472254d9c/xadolemowisik.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00A 10728 bytes
SHA-256: d68ade60d132717dbc77ec578ac0f3d2a0773cf54e824b64f5ddadcdd1e8591a
font_01_sfnt_off0001089d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089D 4508 bytes
SHA-256: c3b0056ad7f835211fac7db9ee619c482e7d6aa9616f921bbbab0c0fc6b1b79e
font_02_sfnt_off00011993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11993 17524 bytes
SHA-256: bebeaadec2bc5a9391d13375de751c9fa2ad480c1d435a193f5deea512a2fb40
font_03_sfnt_off00014742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14742 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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