Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a990d5d54f4906…

MALICIOUS

PDF

74.7 KB Created: 2021-09-08 03:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 22b8f3fd649b2419704b97d2f863dec8 SHA-1: 823c0e6ec544e64d1a497b6960a72fa4b602ff9f SHA-256: d0a990d5d54f49061f5cdc146439f401377aab92e81fd633f65c2da93df85d3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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 http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/lasupuw.pdf In PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/wisomipive.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/befibixaro.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3fde7c576---97025992040.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/razewo.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16098372522cfd---zudeneziwiralibid.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/16022057513.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/69599283682.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/o58li4dvsikqhcv607jd62hgfu/78248513154.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/26392889571.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/d8qi69m9r7oh0g820ll9291c07/fozenogos.pdfIn PDF document text
    • http://cba60.com/clients/6/6c/6c2dd71b6188bc8e8f5adc6209c6f86c/File/77851017145.pdfIn PDF document text
    • http://haki.vn/uploads/files/41873304808.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0ed349ef7---zebiselokowomoxuxu.pdfIn PDF document text
    • https://chp-travel.ir/data/file/99959021022.pdfIn PDF document text
    • http://paliukenas.lt/i/File/92186606094.pdfIn PDF document text
    • https://flyfinz.com/userfiles/files/51380780078.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/nuxulegi.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/noxawunud.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/lokugesaruloraf.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/62601861740.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/8dc83745289c32edcc4214e62f1312f1/fuliloxojawud.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/469307d3199ac41e202770d54c29a2bf/76762633490.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/6975435518.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/3oc8tbqsm6qn7phlhelc4nj03q/67715835082.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad2584093b---72195115170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=is+2062+standard+1999+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_off0000be24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE24 17532 bytes
SHA-256: 9075376320340c34d94c751a575a7021ebac0c0b04a1cd88201009284d0fde5d
font_01_sfnt_off0000ec31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC31 10684 bytes
SHA-256: e1b51af48780d65dc36591d1f885e7e1e5f8f0e373bc4e555bed13cb8a132028
font_02_sfnt_off000104db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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