Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cdcc2c88e6203d6…

MALICIOUS

PDF

80.2 KB Created: 2021-06-27 01:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea77633f40f25bc0cc0a967ef9ff2de4 SHA-1: 95d417e1f0665c3f28eb4bf6e6cd23efb30d33d3 SHA-256: 5cdcc2c88e6203d636560a8c31950e603b6ddf337f618480fe03886a3bff8053
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data, so the analysis relies on the URL heuristics and AV detections.

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 https://wastran.ru/uplcv?utm_term=live+in+a+cave PDF link annotation
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a455c7c9f57---xidoponivodu.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/7ostha251a4uu905ib3h75b6e5/jorewapagidojexuza.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/86151752410.pdfIn PDF document text
    • http://bdn10.cz/files/file/momivulojojibidi.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/16259866034.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/9cd8df966d79af26990a5787a20c4409/22601537565.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/gufis.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210608_C84E3B6091C6D45E.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/11994764203.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/6tpmblf2p68hl1e7aknv5nsiul/95815859634.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/29582371874.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/30544120803.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/gebakaxara.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092af05d8068---kevowupuxiki.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/52ucthq65brlp39lduaae5i95u/wobejoboju.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/17360918415.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210606015035.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16081ba1e37ad2---naferujajujiki.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16087f1e816bf4---puxafoweza.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9dbadb038e7b7e50c51a9ff6b2de15d4/vilupawa.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16085aa9098b59---zezapitupali.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_off0000d55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55B 19372 bytes
SHA-256: 1bf48563234ee1c5d192e5758fdccf67eba8de021c2fe10999333fb6f2665a5b
font_01_sfnt_off00010686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10686 9712 bytes
SHA-256: 321b327e82927260fc58271dd40e6ac0d0814d1d11dfccb715c560c68c72250d
font_02_sfnt_off00011bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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