Malicious PDF — malware analysis report

Static analysis result for SHA-256 3161d642145b9449…

MALICIOUS

PDF

78.9 KB Created: 2021-07-29 17:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6037c1b0d120498c4bece880d8418116 SHA-1: aa3c8f9bc7f66e8ebfa2cbbf8bd3d1561d46cb49 SHA-256: 3161d642145b9449a2e6094ad39c9ca9635f693decb274586c100a5b4330e5bb
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8512

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://alphasigmaoverseas.com/userfiles/file/kivazujewutilalabixe.pdf In PDF document text
    • http://betonkeritesek.eu/Content/files/kabid.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829e6446f04---53477104631.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3a4be7529---20546618780.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609064ae4d6f5---rubakememo.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093b370ae75d---fibixobopemi.pdfIn PDF document text
    • http://ridendo.cz/files/file/14258667845.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/japozabisenike.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/b157db365a382b547d62ed93036ee601/xikigenurebow.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/jubumobuxitaxanejudin.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/pexawirumenusonobutu.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8a28922f0---19001674127.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/t62okb3pm4a7tnd935bg60bdgj/rakezuzoruvukaduxofariki.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4082535a8---37765518002.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/17467767028.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/a88bd4cd24e844d2794cf7c200f2b5b1/rerijajobofusatonozuniz.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/10732045780.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/lidavesera.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2792117a4---7753864639.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/93207105827.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/70915136584.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/2ed99210d8bfbbb75e9f1a5e314f38c6/49004843937.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/60457500472.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/473cb369adbd2942d754783aec3e1500/351710098.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/8a032e0cbc43b992efa05428a5fe3ec6/foxowoxeketigozelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=if+i+have+siriusxm+can+i+listen+on+my+phonePDF 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_off0000f346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 11076 bytes
SHA-256: 50440360ceb6bf95031a9b99846913b82f6ff9530d0a9545b33f552b7f258f31
font_01_sfnt_off00010cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1