Malicious PDF — malware analysis report

Static analysis result for SHA-256 7326ba32ad213458…

MALICIOUS

PDF

81.1 KB Created: 2021-09-02 05:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c984efc4419e2dcba69d11b20dc26094 SHA-1: 4e9a95dd6e698d1d5a059a2ffd3c27b1a4b57593 SHA-256: 7326ba32ad2134586232a32ac35d602efa51ce2c7f4e9121362c60963dc73694
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute malicious files. ClamAV detection as Pdf.Phishing.Trojan further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5708

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.
  • 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 https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/2f1bb1712b5b31f0c143d02be0d2ff28/83843561595.pdf In PDF document text
    • http://all-vehicle.net/js/upload/files/sawazuxiwowetekap.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/jizumanebopixiruki.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/7b2703f50500d686d10af1c655893fb2/vaniwevisoviket.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd1c29262d---kajosija.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/tovilazep.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/jutag.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608907f18f0cf---83001541489.pdfIn PDF document text
    • https://sce.tw/uploads/files/60c1a809216d2.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c76f468ae---vujajadiwofiv.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/1gd3r5drep5gont2qveupeqca2/faxalumuborigife.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/49952516394.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c5b0aba75---zumisuzufa.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/zopulujevelimopi.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630517542.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c896a0befabeceaac54fb738f20d743c/34666963583.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16073b4633c3cd---48979525487.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/gebjfdvivfnqajnh5001ulj1d4/8858116997.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/gunititukobebigusekozeme.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/28e8694f67cfdc581c44026efcc17824/limuvobi.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/bokarem.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/shsmc6a6g872n5bcvjs3o8se03/mefoxokugajad.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/40143634144.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/nosaxezozinetagijif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=sources+of+visible+light+wavesPDF link annotation
    • 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_off0000e75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75C 18632 bytes
SHA-256: 4afed8d7bae3afabdec009ed7bcbe38e5be2b53d38a1d9989ce01bf2c45feeb4
font_01_sfnt_off00011727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11727 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3E 10976 bytes
SHA-256: de2db180ae3f79492f642f419eb53382f4fa1fe8d8dea68a102b70e2c34e5a8f