Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c570a2cd65feb4…

MALICIOUS

PDF

72.1 KB Created: 2021-09-20 04:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a8b71e393b61ecc6b4deb12be742bfc0 SHA-1: 7f8ddc314950f5c11952071406cb1b33fd5345ac SHA-256: 72c570a2cd65feb478a2edb776fcc229156b097527586d6aa3b440a6f1541614
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8295

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/olrvnm7hlgcrsik6aon0ubbvn6/jirovopiperudol.pdf In PDF document text
    • https://keongracun.org/contents/files/faripugofekafumisuzi.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/6877338837.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/18194551806.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/7c69af5e93a2347b498a558a06955e8a/tavedevabetev.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/1367015600.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1632064405.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/xuxugodisotejuwan.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/17631101440.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161448f3d53251---febumokudakorokita.pdfIn PDF document text
    • http://skolky.info/foto/images/file/gifamazurefamukiv.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/24838875225.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/xugiwixomupewiretigamejiz.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/xinorigidomokupojobuzaxa.pdfIn PDF document text
    • https://coluer.ir/documents/file/91862682945.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/bimivapopidubuwekam.pdfIn PDF document text
    • https://onlinendttraining.net/files/860322120.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/51951485007.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/99323847308.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/rapadawavafefu.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109020731333552.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/47298006515.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/jozivunozedefajulipejeket.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/vodelejipesagudidirap.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/wanusituxanedodumaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=world+poker+club+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF256 10568 bytes
SHA-256: 5bcb357492c90eed80b49a11c11d02b3d3bcff72bf3602126f3a02181f7b8557

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