Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e0da4ee6b1ed2b…

MALICIOUS

PDF

88.6 KB Created: 2021-09-05 08:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 00fee85bed977f41f02355c700523dd5 SHA-1: 23d2a8c6ffcc3c12866aae04d6e515c3c1e7ff70 SHA-256: a5e0da4ee6b1ed2bdd21e5eb8c13b6e39c3c5115eb45c0351dc3d27d749ac714
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS uploads and disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the URL analysis is sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://shopcode.ru/uploads/file/parifaramerazamukarisujiw.pdf In PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073784ab1f81---45960839469.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/83776040266.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/80180250136.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/b4c3eab4ffc71a093587e042ad0a3c56/52148299220.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16097e9cd8a1cd---nigikubeze.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/45611389008.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/56515150416.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/zugugadukasok.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b732e288dae---31536968966.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/kanezofuwipesitusawosano.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/022ee58d2a35659f27a0d796c694069d/66455538440.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/34984255586.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/3ea143vunlpqvjpdelkluftrl0/wosojimirudexemipov.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/n1vqt8cdao1iojrffate66h3a2/demexerubepuzajegawakike.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/cc5dc7168fd907e48ca3b248c0822a3d/44120664787.pdfIn PDF document text
    • http://remobudostol.pl/pliki/leluxoxit.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210905040259.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/9f6137d4a6d49171be0371718fa69de7/71939613869.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/42250321847.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/27b809f0f40f18a70e459630c2ef3ea8/xexekajebofu.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf16f46f9e---birixujugulokesitilujevo.pdfIn PDF document text
    • https://tpk-m.ru/files/file/kugirijumufi.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/11964301780.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/ruvafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=nevo+melanoc%C3%ADtico+intrad%C3%A9rmico+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_off0000ef47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF47 10872 bytes
SHA-256: 99d02352d586cafaabd9568aa6de05055f574e3aba38ead099624324d74ae305
font_01_sfnt_off00010805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12017 20116 bytes
SHA-256: 5a6c17567f4066910fe209f1c5423a3071a54a5a1fabf6527fe225bc13249367