Malicious PDF — malware analysis report

Static analysis result for SHA-256 739cfe49e63b20a4…

MALICIOUS

PDF

88.1 KB Created: 2021-09-08 02:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aa69279eb688db906da453122a832b0f SHA-1: bb01f2d77239d3caef09a221dc7b23f159f5f205 SHA-256: 739cfe49e63b20a42303c55c25a840256fab2723e28fe0093f0692e05eadadd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to potentially compromised websites. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS uploads, suggesting an attempt to distribute phishing content or malware. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://crysiq.ru/uplcv?utm_term=tabel+trigonometri+pdf PDF link annotation
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/70711298592.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/33034215031.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/gonodedufopira.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/58769715717.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/57753939830.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/qo5djr4acfpchbuqr7tv4nhim0/58722671480.pdfIn PDF document text
    • https://bagstyle.uz/images/file/kabazoz.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/55158694485.pdfIn PDF document text
    • http://ippon.lv/uploads/File/vofexofeliwomarakakota.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/072b3acfa4051607a7417bbe96fd406c/jibug.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/18928431091.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/78411791142.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf4f5c12aa---menunasopizel.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/94443367901.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/b6e964de749be04f5363a97ee101c477/15241180343.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/it6stg8st7cqc2ekt2531r7ckn/58340678508.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/kudajubebakumasukazifuk.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609808cdaa59e---guwotojugeradafabuj.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb9ba1e00a---2430606561.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/fuxedoxapafozop.pdfIn PDF document text
    • http://chhsclassof70.com/clients/1/1f/1f6d1b94cf555b90b9f410dfa82aea5f/File/94262225358.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/31170936360.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/49069150630.pdfIn PDF document text
    • http://lawyergz.net//uploadfile/files/69050151215.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a63e2659778dced72f9852a44057daf/nigivokolixinunemuziza.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ca382bbafe5---81403154926.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_off0000efcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DD 19364 bytes
SHA-256: 54c4ca712ad0314200d5281c6f09460649a792544defe0004ce94f642afd5a15
font_02_sfnt_off00013a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A71 10776 bytes
SHA-256: ccc29bda402a4212934b1d991274a2c679786685a073409a740d63451de9f344

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