Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab7cdf1599c6c92…

MALICIOUS

PDF

74.1 KB Created: 2021-07-03 20:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a0574c3cf26b9c6de81498a6a594e062 SHA-1: b40ba044cefb1314de3b7cb6c19fc738dba771b6 SHA-256: 9ab7cdf1599c6c927df6fbb9f8c4375e3c04b804f7e321470a6f11494b3fa6c0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://laborke.ru/uplcv?utm_term=the+100+year+old PDF link annotation
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ee91820f1---zitodafegadomipawoxose.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed3e6d5027---gijavekodiropikaf.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/bakafitus.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dc8565c0f---gelogufobesiwarivog.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/59408327344.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/77561392005.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/3c533d98a4765f73105ba86b90b5f5d3/16270259050.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/bb5aeafcdaa3f0653a0a28aef4acd493/beromutatizekopubaxifezap.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/sb8sc80n7ddu75ja1pcms8pht3/77695831135.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/lunozanibetowamazexot.pdfIn PDF document text
    • https://agermag.ro/mm/file/kofufulaladiregozubo.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa9a8ec1e5---botugawuwodikatafukeraz.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c101a3ae908---giwuvobutotukemirokonak.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084317f8eb7d---88892588016.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/xobimuzuxori.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/c49c1330b3b07470fd81cc6c13ab0dec/garurofazapuzelugoj.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/vugog.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25cd192762---46565875287.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/7508352973.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/446ceec72ca95cb1816be27cd14c9f1b/98172567913.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160db1f460b8c7---22021229850.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e4e110057---likobisepukowivep.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/bebawuxopavikaligero.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/rumaxat.pdfIn PDF document text
    • 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_off0000c298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC298 10132 bytes
SHA-256: 98784f88d69ee9333392798981d38011450c278dd80d8e4d6fa765d13ccb4e75
font_01_sfnt_off0000d961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD961 16272 bytes
SHA-256: 5dc192e3817408e13055beda4a6ffb6202165fa751e3147b8a8e9b43f8148313
font_02_sfnt_off0001033d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1