Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f99ee8b41de585…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 04:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a0e0d79f41efbf4971292f6c3366569 SHA-1: 47fb04bf98d4d9fbf7199c9f6c49796deb85cced SHA-256: f1f99ee8b41de5858ffb1e3963f71585e3ab734696d937cc2dff9324e5a8957c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://huntic.ru/uplcv?utm_term=gladiator+road+to+the+colosseum+mod+apk PDF link annotation
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/xitamopaseg.pdfIn PDF document text
    • http://cosyromania.com/media/file/6583245686.pdfIn PDF document text
    • https://ventsistem-bg.com/userfiles/file/69942469387.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/guwoniwekebajidimaziwu.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7cfd89b32---4421844184.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/25540169491.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/78824737490.pdfIn PDF document text
    • http://losangeles.songhakbbq.com/uploads/files/74556483088.pdfIn PDF document text
    • https://creativetalentnetwork.com/ckfinder/userfiles/files/73446748856.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/kikorumuxozovovuxiro.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/90806624851.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e314f53074---senogobivupoxitologu.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/2234364879.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/xoruguserikogobitid.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/wexebu.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/69693403628.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/8286254653.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/wuvulabolixidimedel.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/botezubatidugilipive.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6606136b1---muxijeludiborituxasudonuv.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/burupizi.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/bekopeje.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_off0000b0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EF 16192 bytes
SHA-256: 498a2942739c8c426573067ea5cac7a054371a1b00fb00de93708031c891d408
font_02_sfnt_off0000f26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26A 10908 bytes
SHA-256: dff64647dac48d61b611ade889e24b111d04bdcb1397e7ae1735fe57fef6dfca