Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b32b2ff92d2e80…

MALICIOUS

PDF

94.3 KB Created: 2021-09-05 03:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 66b5afb5e0a064142897555f9d32706f SHA-1: 1872ec79004372f75d9548d2264ef38a57388a56 SHA-256: 23b32b2ff92d2e805ee5e9bcf47dc8842d5ba3a7f9fbff4ed5728e8788fb2424
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious sites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/repivatufeve.pdf In PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc4f1fa07ba---zuzewolo.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/pirugilotujosunoxopisir.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dorajedinijopefej.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16106929995840---18247736941.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf8343917e---bamavop.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/3941751201.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/21617336067.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ec3c82455---1225210.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b56340f0036---8330684614.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/6966936712.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/44554384388.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609c67a2abbc3---rerufigamaterov.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/64316823397.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/526e3dae4281f8e94b3d020b69d61f1d/xikividisolesokibugu.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021060914545482.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/gjv1qvg6a8r4r41rg4e1og1a6a/17573110511.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/23621981343.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/94170310828.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/vanipuworujezixinoxawosog.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e04fcc07d7---joguboganurirexijibi.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/7641991527.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/pvtgp2trs50ta52er11v3l34jm/60953840037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=gnp+definition+economics+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_off000109a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B5 19204 bytes
SHA-256: 397780ffb77d584f4e3a0f7c5f9f258bdc23c0daa5c0ddc7524cfb26b83a1c2f
font_02_sfnt_off00015333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15333 10512 bytes
SHA-256: 0d5dcd45a1a7d022a0fd5c2c9d56d2589aade254b3b35d0b30523694095249a9

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