Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a467035fea2ca9…

MALICIOUS

PDF

77.4 KB Created: 2021-07-13 19:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: b134313d81f84e6c506ca96078094df3 SHA-1: 5a135eae6fbeda632f6a6b671ca3ca3f7750b473 SHA-256: c0a467035fea2ca928589fe52d56ce8616e80d14f3ebe2902b37af8a581420c1
156 Risk Score

Malware Insights

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

This PDF file contains numerous embedded URLs pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and numerous external links are consistent with a tactic to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=exit+music+cover PDF link annotation
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/e4a50afc2fda13820c93a3df293e0ee7/rabofemu.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160848a378d8d2---25044070506.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160e8c889a6977---mopikitemedoninokajogedi.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/71510f00da1e533d1613dcb55c7fcbe9/fekinowiwuw.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74cb285d51---wivamikidirebesuvabobamo.pdfIn PDF document text
    • http://jucal.es/images/file/41544893.pdfIn PDF document text
    • https://pasarantogel2.com/contents//files/65213976222.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/2oh9heu3iujbsmi35ojqjvl9ki/70632591124.pdfIn PDF document text
    • http://apsons.eu/files/file/76150960450.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/juzubabatagi.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/nadiluwalokisuw.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/gazepakusaviliradakab.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/1llc9kvmjul4k97psjtei0g9r7/25218817896.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/98210319613.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/12282579848.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bf816df66---75564138907.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1379323244609151661d4f5.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/87533033379.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/c64755ed29fa6dde75632fec80acbc2a/37355122024.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/95995224850.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073f3f4f40bb---96839032132.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/16774615918.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_off0000cd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD83 16968 bytes
SHA-256: 56f045f4d29b2decb59f18f4ea039e45d8363147ea553df2b72d2b7474ff133c
font_01_sfnt_off0000f955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF955 10332 bytes
SHA-256: 40b80dfe1b68c3b49fb8dcce0dee4d4d5a6d0f3ecd49910a16564c1024934b0a
font_02_sfnt_off000110b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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