Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f09583cc83798be…

MALICIOUS

PDF

78.3 KB Created: 2021-07-18 15:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b630bbc289b3e42168b0aa63cf8c6f9a SHA-1: 8bd620a09ae0be7ce4f42b1c58cba6a4fd2228ff SHA-256: 5f09583cc83798bee1fe39ca721501eeba78379ca29c4c7f0e7b6f93c85538db
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to compromised WordPress upload storage and other disposable hosting sites, indicating a link farm designed to redirect users. The PDF's structure and the presence of these links suggest it is part of a phishing campaign or a distribution mechanism for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://atek-ent.com/upload/file/58130111813.pdf In PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/be7c1d285c5d7f949ce74fc453c2b6dd/38537701216.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/wipusoxovirinefajigazeri.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed5e3f402e---29416147163.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/bujatu.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/86375101479.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/be6baee40af7214bff2151f9c6c18b4f/46027539030.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/mimitefenawafiw.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/11337845536.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de5b54b65ed---33125098172.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/0cb619e904fadd2656c60e23b0740b27/gumuturekosozeb.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/32342873195.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e4acbef68---dujore.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d6419bb68---jetojafogasanunofuxurov.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3efedebb03---vovimereserilalakurikab.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d60f6aa23a0---38397412116.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/vabefowanekilezeravar.pdfIn PDF document text
    • http://shopcloud.cloud//ckfinder/userfiles/files/lozowumatijebupawu.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/24234aedc8b64014a3844e00fdb622ef/xelufunosekojeza.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/wolapomo.pdfIn PDF document text
    • https://ewt.cz/res/file/fuganegigufadobuw.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/fa15461cb05134a4c48ae4c3ba4a375f/47907990178.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/59441685527.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/32b75498af98c0399c16b9560981c868/97842122851.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/gadako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=scent+evidence+k9PDF 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_off0000d027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD027 10168 bytes
SHA-256: 2504363dd9debbcd3d6a43c4e11d2e659c84d503b031fef42701baa4c8db49ce
font_01_sfnt_off0000e718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE718 16960 bytes
SHA-256: 055dd690ea0845922299a490dad169e20e38a8242d3ba53af18c3e521320bdd7
font_02_sfnt_off000113a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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