Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aec80b54100c7c4…

MALICIOUS

PDF

83.1 KB Created: 2021-10-05 19:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d1517f47dc6de8046ac636a931f9f631 SHA-1: 088350b400fb649fda7dc522a3bf5754f723d32e SHA-256: 3aec80b54100c7c4f37c127ab4e2879a9e999d7d4c0c4427558c3fa328d53a2e
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious sites. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of these links and the detection signatures strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6260

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 https://ketchas.ru/uplcv?utm_term=questions+and+answers+for+sales+assistant+interview PDF link annotation
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/fef23f3c2479ac93be55382e77529b60/80275756200.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/57523353998.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/82763610329.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/sotanunusalaxipalojaf.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/vigufonurakisawowagekelo.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/f49ac2b66a3b6f503636335081b977f0/35746671984.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/22538197301.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/gewep.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614013bc9d118---73086103684.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/rizogupezepap.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/17047032209.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/kepiminaredesilajo.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/purupipejujaderuzupopexix.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/7702621844.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/37221093678.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/kijuvisafifa.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/mozoribixe.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/91251558561.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16142f86d6b46a---3840433166.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/muxefimojovepo.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/38873493005.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/jaxekisukam.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/getaraduj.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411397a1535---43507588133.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/77067311067.pdfIn PDF document text
    • 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_off000106ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EF 18148 bytes
SHA-256: 7fdb43037dc5de06de1485e6059b20fed33570a37a63888e5a6438eef543a322
font_01_sfnt_off00013636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1