Malicious PDF — malware analysis report

Static analysis result for SHA-256 533a9d6fd4545264…

MALICIOUS

PDF

78.1 KB Created: 2021-09-18 16:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d21ed3359addf971a8fe65e47b89df1 SHA-1: 5b569ecafca81a4d27aa02a92d6962bd63fffc3d SHA-256: 533a9d6fd45452648b0a7bb1db58c8759a8a804c8ea2ea5c1a880a1f5156aed5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6390

Heuristics 5

  • 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
  • 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://catamma.ru/uplcv?utm_term=lucky+patcher+free+apk
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/78024342531.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141182245863---pukapuramipuvo.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141983c29c4c---raxukosutaju.pdf
    • https://momentous-inst.com/uploads/image/files/33674024774.pdf
    • http://anninh247.info/upload/files/10017396698.pdf
    • http://alde-pace.org/ckfinder/userfiles/files/vizesoruwukalupanuvofu.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a8255c8d6---rubam.pdf
    • https://groupunsur2.com/contents/files/godipisosotajejonaju.pdf
    • https://kawanmto.com/contents/files/70438852764.pdf
    • http://streathamtaxi.com/survey/userfiles/files/togunatakimus.pdf
    • http://lindendirect.com/tempimg/file/62076916295.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ceaffc84a252e553b08f1e6a371aed7c/zomuxanajokijaxoxusizefol.pdf
    • http://kiko168.com/UploadFile/file/20210904052026354.pdf
    • https://clubelsendero.com/img_pag/file/zinewanofitojewofidobedil.pdf
    • http://ahkjt.com/upfile/file/3696841974.pdf
    • http://w-mill.jp/images/file/vowoxasegexizer.pdf
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/7777933386.pdf
    • https://hoalavender.net/upload/files/1670661479.pdf
    • http://yurisolomko.com/userfiles/file/zunikurez.pdf
    • https://asztromiskolc.hu/ckfinder/userfiles/files/zopitekerisolufujo.pdf
    • http://wcsps.com.tw/ckfinder/userfiles/files/57970086050.pdf
    • http://zovsh.com/Uploadfiles/files/76623549649.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/xigagubajifesi.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614593f1b807b---tezarufobozusoponafifomuk.pdf
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/wupej.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbf8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF8 16792 bytes

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