Malicious PDF — malware analysis report

Static analysis result for SHA-256 16bc3708e7f49786…

MALICIOUS

PDF

75.6 KB Created: 2021-09-17 17:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f9b5f2a27460812d851640b6cf0a9fd SHA-1: 9e7f51f6a284ec21e8020a83ca7bd6d236258c88 SHA-256: 16bc3708e7f49786c6e3e90181c0eeccefa6d3bab3f5fae16a17c6dd98fcd384
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with numerous external URIs pointing to potentially compromised WordPress sites and disposable hosting. The presence of multiple links, including those with UTM parameters, suggests an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://cructi.ru/uplcv?utm_term=injector+diamonds+ml PDF link annotation
    • http://chanassociation.org/uploads/file/73078445513.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324863a950c---38372317640.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/fesuberenubozipodiduvem.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/fegeraneti.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/guwifasemik.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/rebakimawezabepozuvin.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3bc49881c---fudigepot.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/widuletutitemotefesu.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/lelexo.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/fotubotewida.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e1655c0e5---12257427422.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/515227641.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/45035469040.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/fc9c8c67086937809283eade11b68ef8/22017420535.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f49dce1f7a---mulunojimofodepafuxowu.pdfIn PDF document text
    • http://soupworld.de/upload/file/61188801957.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/78606478022.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/17817383664.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/39924664442.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/dejekodevotadezapuw.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614229268e75f---42194559374.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/rukugefe.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/eff339ebd5a6f94c4a446cd46859043a/73795195824.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/29576195866.pdfIn PDF document text
    • https://gencatakan.com/upload/file/todafeb.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/benifikukipego.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/32749196245.pdfIn PDF document text
    • https://aromamarketing.md/img/files/72615062028.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_off0000c520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC520 16672 bytes
SHA-256: 1e949b0de190f9786ed216133ee052e191a0e6dd96ea0984220712f21d4f2d4e
font_01_sfnt_off0000f02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02A 10612 bytes
SHA-256: 7773bcaa90c2c93daf96e977d5bc17a3eb5976e494b3398abac63435a55d821a
font_02_sfnt_off0001085e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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