Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb97d8e224831ab…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 06:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f44df408f04e41d287fe65697d41e3b5 SHA-1: 941b498854b8351c12d1f7ee1265f28f60a57a4e SHA-256: bbb97d8e224831ab0594a82d3c4e44565eeef1eca5e293de9f599ec96792444a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to external resources, many of which are hosted on compromised or disposable domains. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or malware delivery. The presence of multiple PDF link farm heuristics strongly suggests this document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5836

Heuristics 5

  • 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
  • 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://gocreate.termall.pl/upload/fck/file/98692061801.pdf In PDF document text
    • http://alarm.pl/userfiles/file/mufozifuxumu.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/pukomolovulewupenunixezis.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/c70e12985135a628f1ea53686a112eef/komumisutamedazo.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/38684845770.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/buratenejozidud.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/24842483966.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/mipewexituwolonujag.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/9955bb725440e7b7690413e3ec49a950/wozawoj.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/25980950992.pdfIn PDF document text
    • http://eur-idea.com/userfiles/file/pagifobajofikixuzabakipuj.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/64312699098.pdfIn PDF document text
    • http://juentai.com/userfiles/files/radodoruvuferetotazavifar.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/xitepifevoxuxa.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614ccdcebd06c---lekufalimo.pdfIn PDF document text
    • http://chanassociation.org/uploads/file/pevedavupupuxotuzofani.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141577b5db83---daxoxolowofazuxuvir.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/doworojoxekogugiganesab.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/15024823648.pdfIn PDF document text
    • http://showpelec.com/data/file/20210912_040229_823.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be7ac763b0---58465749747.pdfIn PDF document text
    • http://topstec.com/d/files/pozeratixoruno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=clash+of+clans+hile+2019PDF 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_off0000c118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC118 20316 bytes
SHA-256: bee034b5431becd4c144c05627e2ff9b4fe4b533acfb3f80cfac8e9346909c51
font_01_sfnt_off0000f5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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