Malicious PDF — malware analysis report

Static analysis result for SHA-256 511d2ac7a385028d…

MALICIOUS

PDF

77.4 KB Created: 2021-09-26 09:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 66a6c88dea26ca577632954b2e7a0433 SHA-1: 51f8e07072c8a8cd87046588b93ef6817f9e36b9 SHA-256: 511d2ac7a385028d877368a30fa1abe3940e7ff67abbc8a5bc2ce05661ab5441
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised CMS uploads and disposable domains. While no scripts were directly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection or exploit vulnerabilities, hence the inclusion of T1059.007. The primary attack pattern observed is the use of a malicious attachment to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://vivaibonomo.it/userfiles/files/geluxuvedeka.pdf In PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/d0b04f7449bc725000aab891948c3eb4/povowij.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/muzotamekaw.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/57252032266.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/41515662897.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/88046085103.pdfIn PDF document text
    • https://ms02bet.com/contents/files/walamotevugurox.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/nuzegobin.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141808662db6---43426654209.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/totetufuzovizunavani.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161300ce6eea9e---78541639073.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/19e923100fa078a94f871ba439ae2c26/25047985719.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/76777461002.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134d13718059---futofavaxekitomol.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d44bde5edd---keweroriwunaluxiluzaj.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/kakegaxonobajeg.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161500550d02a3---81545801955.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/82984902796.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/13638123026.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/wedexixakofitogapotu.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/batin.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/tapematonilapuxujij.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/dikow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=stickman+physics+battle+arenaPDF 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_off0000c022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC022 21064 bytes
SHA-256: 74cbab38310888e431432db5402652fa27e238dc678d86d43c19f79be419b1dd
font_01_sfnt_off0000f6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CD 10940 bytes
SHA-256: 0fe5005db318f56300bca32c621b3933caef812fba9ab77e1cba2edf19305370
font_02_sfnt_off00010fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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