Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb37804afbe6f29…

MALICIOUS

PDF

87.6 KB Created: 2021-07-23 01:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2770f23319d5fa3a12805f0ba2c649dd SHA-1: 599e4d7eb478f0356aa375929334580a4770027a SHA-256: dbb37804afbe6f293bbe0e9cebaa8f4d88b93c2ae3af023f21548b6af5c4e04d
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which appear to be hosted on compromised or disposable domains. This behavior is characteristic of a link farm used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/75582324638.pdf In PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/2f27b5d36b1fb0c18826be42ac25dd9e/95250116769.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/u10t8bmqc9ngevee30qo5k42hq/madotolaxug.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/93262434546.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607304352a53b---ragiduzawatoloxop.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/8702890695.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/loloduk.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/nubezi.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f9526c574---korezofazam.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087ff2e2daf2---96420300876.pdfIn PDF document text
    • http://soles2walk.cz/data/file/63152959595.pdfIn PDF document text
    • http://sparkpro.lv/content/file/jafawegobigujumuwe.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16093a59b14076---38367919345.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/60533909490.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/92239487332.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/xukutilude.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/61768785221.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c014e7e2dd5e9de06d3a603620d5e787/gojikizobabetatowojutafab.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/82701768516.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9a4f95042a44a72c64ce1a427c28166d/raxogabo.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e8f458ded---46096937176.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a58685a17---kifereniribasidumutig.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9974699121---83915669145.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/20a75fcd12193ba3cd945588ed2e681f/58948563153.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/73423600878.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d72380a123023248117fe4a134b6a631/93994467196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=types+of+cells+in+epithelial+tissuePDF 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_off0000f704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF704 15900 bytes
SHA-256: 9acfa5b0969aebeb3b7d18b1987bece615c9d2b6a4f238fe2048ff1d52415cb4
font_01_sfnt_off00011fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EC 10652 bytes
SHA-256: 5fb4c1e941a309564acb06cac482f7d158499016d8da7c24774b309fc1184369

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