Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c26ae1897e99b6d…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 06:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a0d5cd7353e01dd472f7d761f8b1832d SHA-1: f4395299ba0a1646b2ba1f4fca33c59bebf6f70b SHA-256: 5c26ae1897e99b6d661e839cf3920491053ea91c82f5c62cfc7b0a313a7da497
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Multiple external URLs are present, many hosted on domains associated with compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure itself does not contain readable content, but the presence of numerous external links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/7k542r4eej61354chn016ao31i/77504936898.pdf In PDF document text
    • http://haustechnik-hagenauer.at/59680184605.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607195674618d---lesulabejurepi.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/zosuronilotopuli.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb4e5d77c5---93097628390.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/levavima.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/29978364110.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/fewud.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/f9d4cb00af31eddfde5f9b6ebcbec796/28365081471.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/60566844332.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/04824ad8d2957c2dd890f3b9f3c8ac75/mokuf.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/1336e6f5f82c6742d15d5d93aa9adca4/bojadefaxi.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707915d9970---koxanokokiva.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/88660632869.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/nnmdemtgsvufqcjcebkfasnmra/5865561603.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ej0ir4nuv65p6lvgfril0lkrqq/riwevewupo.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/1a9cbd42c8f04a86e029db6eff2e7f90/43597692505.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210809064402206.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/98695982313.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/40930389827.pdfIn PDF document text
    • http://sunnysidehigh65.com/clients/d/d0/d00d1ad1640c45b888f5e58ac216a5d1/File/73262940158.pdfIn PDF document text
    • http://grandviewcommunity.com/userimages/jevitasidanixevip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=negotiate+meaning+in+tamilPDF link annotation
    • 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_off0000d573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD573 10160 bytes
SHA-256: ce9d668ecfdcd55a18764fffd06c682fe7d408bd34229a6d597162f0a7acac64
font_01_sfnt_off0000ec1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1D 22112 bytes
SHA-256: 3cf440f5cce2270ea084c032bf1762561816e5ee554ece7d80e5aabec491bfac
font_02_sfnt_off00012538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12538 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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