Malicious PDF — malware analysis report

Static analysis result for SHA-256 692848f6fc25f3a5…

MALICIOUS

PDF

76.4 KB Created: 2021-09-17 05:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7a522f19e30543aa23738b8df947bbec SHA-1: 10d2ed8ea14700545ab05ef5faa06ab5b848cd01 SHA-256: 692848f6fc25f3a518c9e0989d3a9de79952ef2becd22ea0f98d0fe58cb95656
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://membranekeyboard.pl/_data/file/32568280839.pdf In PDF document text
    • https://aordonez.com/images/contenidos/files/49512411841.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/18027327887.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/63075452889.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/43693224009.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/21809923095.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/27226979167.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/figejiwu.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/3faa79362d6bd437024bbc89ef64c5e2/xemozelukavevusoduka.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613915fae4727---75936461506.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613671143b313---rirobi.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/vajujivokivofesigajus.pdfIn PDF document text
    • http://greenbrier101.com/userimages/xudirezatolefo.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/xapabixawe.pdfIn PDF document text
    • http://demkapi.com/resimler/files/92882610345.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/nevibikapukotiru.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/39971790641.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/8d46d4093772715abbeb8e871891c4cc/53175005825.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/22062241232.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffe9ac9acb---fenusimejuzadumefem.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613e06aa7fe31---tamarupoxazapavegegofiw.pdfIn PDF document text
    • https://istanajp.com/contents/files/51961506580.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/dilirepeluxuratejabof.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/6219058151.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210909085606.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/kipadibaxevajimej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=best+love+shayari+for+gfPDF 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_off0000c0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C0 10624 bytes
SHA-256: c5339a2430c7f80d9746119253d0254eef49424863a28ea01c11fcc3923555df
font_02_sfnt_off0000f147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF147 19572 bytes
SHA-256: 2a256cd9fa58f550a40b7f6943392e143b90c01497318f116e251923cbe86b56