Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eb279b8a2212ec9…

MALICIOUS

PDF

83.2 KB Created: 2021-09-04 14:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 59f5f7778b9289586641f0b0458f1463 SHA-1: 49fdd244824a2d17f106d277ee3ef7f747257ba7 SHA-256: 6eb279b8a2212ec93c8d92f7185d1a67e25368c1e758a7deaf93fac5f552fb5a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing pages. No scripts were extracted, but the structure and URL targets suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/6f7946aa334750050032c972846c6c1c/joxisubu.pdf In PDF document text
    • http://10glazsikeyrosa.ru/file/pilaposivusixedatekiliz.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c604fb39b6f---42522790627.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/80848120085.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/28036821787.pdfIn PDF document text
    • http://builderall.info/userfiles/file/43091652150.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b8750fce641a0c2e5bbdf4f1dc3d3ecc/25977277245.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/26a9412a8413ed2c6f8ec7d92a15bb5a/51387924676.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/fe03d67267415bb712b20cc7728776db/70774608624.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2bd31c4a7---bapejuf.pdfIn PDF document text
    • https://parc-hotel.info/file/84425637791.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/29aada5bb85c06c4aa4303e3a3489da7/jujokatiduvawimunoriwonu.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/makosovojozoma.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097232a5163f---xapan.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210616_204654.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/6e71475ef7813b5b2439baf99c372322/19671385406.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/7374750159.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210818160323.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/0145hra5i7c2egdgiifjoj6136/27635121070.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/18499213961.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607391cd07a3e---35518111615.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/99124921503.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/vudasijimikapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=portugu%C3%AAs+arcaico+pdfPDF 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_off0000d83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83A 10776 bytes
SHA-256: 2087310f920a7efcb80ff66ccb45dc4bf7a87b3318a7520a07d3c0297c819f6c
font_01_sfnt_off0000f10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 20824 bytes
SHA-256: 2c776a9c8fd4dbeee8cf5ec0f85f074038fe1eec9ec0204822a451bec0b626ae
font_02_sfnt_off00012568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12568 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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