Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77de36faf329cdf…

MALICIOUS

PDF

49.8 KB Created: 2021-10-03 01:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b863d31f8f9d9946a0346768918b6cf6 SHA-1: eb34e4e8fb6571cbc2358e52b5531616e5c293da SHA-256: b77de36faf329cdfd9b8834587f92a12b21bd3b83e057438530549fc8b92d7f0
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8302

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://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/gebosowibaximemakaloviti.pdf In PDF document text
    • http://kronospan-mofa.hu/editor_up/pamowose.pdfIn PDF document text
    • http://hadt.vn/upload/files/69878498391.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84230308.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/96745259789.pdfIn PDF document text
    • https://network-italia.com/file/zuzapezuwejogugimakokof.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151ded20f887---82344672047.pdfIn PDF document text
    • http://orlickachata.cz/files/files/zonuv.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/61217634376.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/44e9d4a8d90b61c910470bea518d82f5/12822041488.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/60142463013.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/40200403459.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/tonipinemalem.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-13/20210913050305659153.pdfIn PDF document text
    • https://breedlife.com/upload/files/5146725387.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/78552775902.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/31307570585.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b739bee359---zibigifabijoduligakalanij.pdfIn PDF document text
    • https://ekransamara.ru/files/5171942259.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/59241337203.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/30211512260.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/mivomosabuzurek.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/pomebenufilejobuwitot.pdfIn PDF document text
    • http://atem.sciara.eu/public/upload/file/babiguzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+twisted+ones+graphic+novel+read+onlinePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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