Malicious PDF — malware analysis report

Static analysis result for SHA-256 43552fbf89d49ac8…

MALICIOUS

PDF

62.3 KB Created: 2021-09-02 04:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 449316e83b7a7750fd2aa33c2627423e SHA-1: 67172c93c12781d2183f6651cde21e2d4cd967e1 SHA-256: 43552fbf89d49ac84d42333bd07b67b6da2bdf1dd198fed9cedeed4fefca8f45
154 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8194

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://wastran.ru/uplcv?utm_term=something+in+the+way+acoustic PDF link annotation
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896453a90bc---96439049478.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de73abc6098---51776946615.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/peniwok.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/20270905992.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160bb43bf68ec8---8095170814.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/4a03c28123f5dc8800e0738b8513c9db/17232561719.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/sebugosejeka.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/jiwonelabozusoximu.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/ecae621d67f6d9f5f05c3d8b796a5187/pirebojomibex.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d48ff7f29c---12790482785.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ad3ea7818---4120496482.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/wukanojuxuver.pdfIn PDF document text
    • http://htwy.com/upload/file/45945585637.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/betofop.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/4222071380.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/47669916433.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/421df454c9b1ae13eeb96815e138c320/nesobugekulemugadag.pdfIn PDF document text
    • https://pellevah.com/upload/files/2256883503.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f27e1f0c046---pawupobisoko.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/rerexepokitafowukomi.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/nutag.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/vafoxexan.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c50c0b4afd0---18397613455.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/70a2cc9b632882b09e4f7d03918c9491/wazomijob.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609637a32b865---17474828971.pdfIn PDF document text
    • 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_off0000cabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABD 16424 bytes
SHA-256: ebccdca614254295672f0bd2f4957ae1d450cdd568d29d3b108882d600cad160