Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86f181bd558606f…

MALICIOUS

PDF

90.7 KB Created: 2021-08-09 07:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6bc153c53c1fa5c9c563a085d3730bd6 SHA-1: 71ca07c14d31018367d2f57e4c572a30871d4224 SHA-256: f86f181bd558606f23a0a2d07d362bf844d29c769d698558ae0516cd1df8b17f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to direct users to malicious content. The presence of multiple external URIs and link farms indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=alesana+the+emptiness+story PDF link annotation
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/m6b26abtcmppjdgnjngj12vuae/93588700615.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/da7b1b2790788121d46af8453f08f985/wakesipipuwejidowor.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/dutoxoz.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cf662d4f7---gejivumoxubisan.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160789784eda77---81590584527.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/gowanazulideduta.pdfIn PDF document text
    • http://fabtur.ru/upload/files/22239978533.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/nosuferowifinimumegile.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/15922496747.pdfIn PDF document text
    • http://hibertek.com/image/files/20210628_022830.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/e7b1b517f5e80cb12829a87eb96b2d73/motufibumuzigenapigelape.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/pebabi.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/32346773792.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c98831f74e---wodojuwipukumesip.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9538851b8---39236187629.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/46691504572.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc150256ee---xojimowuzowo.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/6s1s0qsa6ahjr0pomm0lsf0h5n/gifetexexojubukogulipo.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/52173911067.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d2225355bff---75244523901.pdfIn PDF document text
    • http://trevorhannant.com/zedizijipatu.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a31e7720818---megebobaxowanu.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/kepulevifovulufimus.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_off0000fdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CD 10612 bytes
SHA-256: 4519049ccd9f8d03f56a081c284f632147249ce22e5cecee851a8ee58cc455a1
font_02_sfnt_off00012ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDD 17028 bytes
SHA-256: c387fffbce38284afbef2982b7c2d6cbcabb2614c6346fe684735f5da3189f1d

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