Malicious PDF — malware analysis report

Static analysis result for SHA-256 21469ecd447a3e1a…

MALICIOUS

PDF

64.1 KB Created: 2021-09-01 07:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bf3f1f2f448b6e0ef22759db5572d07e SHA-1: 0ff297456b0a729bdd4ea08926aac5728e07df58 SHA-256: 21469ecd447a3e1a5c3ce519a0360d6dc3554d816ae9656677d5dce9cf64e47b
154 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to obscure the final destination. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9364

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 http://greenld.com/userfiles/dajida.pdf In PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/b4fc789b7a2f9a306ea55d697bcf15cb/16716233995.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/ng8h03tepdcoppk12e4g9jc2va/88678167890.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/59755863468.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/bizolinoxalojonolani.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160be974330b12---rogiludubepivamufave.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/tokuwesorum.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/wulofib.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/bepugufezetiv.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/baxutasab.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/fokuxivefu.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/23496381798.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/ad13907bc432a2ca7a9378706f741b63/84543856101.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/jejunexunut.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/xuvatezodimi.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/o6tsc7urd39kafu2roemq8m13a/wotavegugolijotis.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tetufiro.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/jiduwolofu.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f1ad0e2c2---73418014744.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/47916311207.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/47523236813.pdfIn PDF document text
    • https://bonekarusa.com/contents//files/xitoletopezapiwururinusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=drying+food+examplesPDF 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_off0000d308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD308 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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