Malicious PDF — malware analysis report

Static analysis result for SHA-256 36284eb8ab1d77d7…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 04:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8bb4bbd02eb2e93614dc8a50839bca28 SHA-1: 37e12a16d5eac21cf07e44cd8d7671cf8812ee81 SHA-256: 36284eb8ab1d77d757d8b50d2d37f86884c4bb76b4341c3216689044c8b80b72
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a3836c3254e49fba1268e3558a45503f/xebij.pdf
    • https://vsetinrally.cz/userfiles/file/95863145203.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409396f1d0b---gozadodolofo.pdf
    • https://ferropula.hr/files/mewigiv.pdf
    • http://learningkey.org/userfiles/51169365547.pdf
    • https://cleaner.pl/userfiles/file/gitimawetuzulilifadi.pdf
    • http://hzqljsj.com/images/upload/File/vudozazogafurixa.pdf
    • http://bearings-home.com/userfiles/file/55708994777.pdf
    • http://poliinc.com/upload/files/wigotidapusovazeb.pdf
    • https://royal-art.pl/uploads/userfiles/files/lisisa.pdf
    • http://niktid.ru/userfiles/file/pilukasubodibiwagimijino.pdf
    • http://extrastyle.ee/ckfinder/userfiles/files/desodokezuw.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/s40mpehopafk33a6pj4ae5umr8/bobugewiramofovemoside.pdf
    • http://megatex-plast.ru/pub/file/wowaranesijo.pdf
    • http://gasasosong.com/upload/fckeditor/file/luwesewonesedekatigexared.pdf
    • https://zmiz.hr/userfiles/file/terafewebiximavujugeviz.pdf
    • http://sugarfree-gelato.com/upload/file/42082761063.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cdb1359b9---nobiwizowigunuz.pdf
    • https://szelvedojavitasmiskolc.hu/files/files/1290977421.pdf
    • http://canavesiobruno-architetti.it/userfiles/files/sitebotuguzejivujifovuj.pdf
    • http://polipadel.com/userfiles/file/nabikesobebezer.pdf
    • http://geoodwierty.pl/files/file/20455641583.pdf
    • http://daivupaint.com/img-chamthi/files/bifafosilarigukid.pdf
    • http://whipitleather.com/userfiles/file/vefofijekiwaj.pdf
    • https://magyar-logyogyasz.hu/fileok/file/gokatavuxuduf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=vuit+android+tv
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daa3.bin
8f93b1c7c7d75106916e7a96279cd8642b9ee162f80036787b70eff712496b60
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 18244 bytes
font_01_sfnt_off00010a38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A38 16792 bytes
font_02_sfnt_off0001224f.bin
294cb76e13d218eb7fceeb891d98a8e02f2e2a3263c6d7b6544be06b0c52025e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1224F 10032 bytes