Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5bebe54cead54d…

MALICIOUS

PDF

87.9 KB Created: 2021-07-15 10:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dabf5e042bc8da4eee8fbb708ffc4167 SHA-1: c8ed51a7e3ef39dc5a2f449f13bfd418871c2fbb SHA-256: cb5bebe54cead54de2764265187d07afdc44ff0c8671ee1784f8385c6e5d8b19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a redirection mechanism, likely to a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drafthe.ru/uplcv?utm_term=hacked+apps+and+games+android PDF link annotation
    • http://remaining-mc.de/userfiles/file/seximomaz.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dcbe9e3d9---24788591360.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/136353a1d51a1d80cd897eeb4171aa87/59191190899.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/bowolimomuwopurijovagojo.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/wawaxavoperavelomit.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021062910513570554.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/makuravaw.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/jemekepidaluvigel.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ec0d4f09c0d7d8f68fa2eb286b82fccb/burazoxujawog.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/mexusora.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/4aa5a9fb466ff423f4b0244b853a442d/dadavuredufiginedilikup.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/402d5a66002ce67c91cb764f8724c4d0/xujoxiva.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/68522308038.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/ba5567c4297c204ec06b81a6a44c7f8a/43353313911.pdfIn PDF document text
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/megesujanodigesetesidix.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d038994a80---5836157269.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e04625f07---duwovuxelum.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608856bf498c8---vovawazupu.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/votakujul.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/2662498628.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7be88a65c---loloberopijofowe.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/degugi.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/i626q70v61ij9qpc2bivk35f8n/92172870701.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/vodavixejugekodo.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_off0000f4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B4 17236 bytes
SHA-256: 2acce801dd4a0b772edfc89a2b45dd7424b86914cb906ac48a5e650708bfcb6d
font_01_sfnt_off000121be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BE 10796 bytes
SHA-256: f45e0818a3cc61e167712deeef348895f2bfbfe8471317e107b951ed4ff6de5b
font_02_sfnt_off00013a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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