Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4af6ff9cdb20397…

MALICIOUS

PDF

66.5 KB Created: 2021-09-16 09:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09356395d743d9d6613d870c73341b08 SHA-1: 2101f9f8ea4c3e6dca6d1838f2f93647e9f4fb4f SHA-256: c4af6ff9cdb20397af163b5bde1fb917480787f5bb7030c501099792229d6dc0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm on potentially untrusted hosting supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5231

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://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/gme77c3mcm2btisaae3a0c3j1v/23364395863.pdf
    • http://hzbmsj.com/images/upload/File/jitod.pdf
    • https://gkia.org/kingkong/userfiles/files/xomiveguka.pdf
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/18929029793.pdf
    • http://www.jasolasia.com/image/upload/File/96622610485.pdf
    • https://gamaconsultores.cl/upload/file/delesogip.pdf
    • http://johnmarzillier.com/ckfinder/userfiles/files/juwogagu.pdf
    • http://jiachuankeji.com/upload_fck/file/2021-9-1/20210901161003977286.pdf
    • https://pt2-turbo-j3t.com/contents/files/45804485326.pdf
    • http://nissanotogovap.vn/uploads/images/files/fezenabilosowewevavirogul.pdf
    • http://mertcelikkapi.com/userfiles/file/40207901389.pdf
    • http://tomasmrazek.cz/userfiles/file/92421759106.pdf
    • http://woodbridgeabw.com/uploads/files/ganosezedavi.pdf
    • http://jcon-aps.dk/userfiles/file/80513310481.pdf
    • http://agavietnam.com/img/files/sanubonebujupin.pdf
    • http://puginternational.com/ckfinder/userfiles/files/73049509465.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161400c0dcaf00---64989358761.pdf
    • http://phrabat.net/UserFiles/File/59667241875.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a20af818ce---61177940883.pdf
    • http://jamalcar.com/userfiles/file/73807357551.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f08eec07ba---puwivopujesopatinowewa.pdf
    • https://by-express.com/upfiles/editor/files/wiwagutikiwelusa.pdf
    • http://tg-focus.ru/userfiles/files/15066466322.pdf
    • http://harlit.com/upfiles/file/72724399922
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=best+editor+apk
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d74e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD74E 16792 bytes
font_01_sfnt_off0000ef65.bin
789762d018b45de7737d875944120e29bf9bee0573ec901144c3397637d3d7ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF65 10380 bytes

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