Malicious PDF — malware analysis report

Static analysis result for SHA-256 8516811b06debf71…

MALICIOUS

PDF

70.8 KB Created: 2021-05-06 18:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7dd03570854a562d607a163249a11e3c SHA-1: b1de78f02cd7a76716b971981878e4e7c8963409 SHA-256: 8516811b06debf71f3ac734c3862b6dfdc6e85ca7bbaf8569f5b1d4c2d63027f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS upload directories or disposable hosting. While the document body is heavily obfuscated, the presence of these links strongly suggests an intent to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9785

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://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/692bc35a30177a891a14c87b5ac22a28/68655501668.pdf
    • http://adance0112.com/upfile/editor/file/48106734253.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160749afecb6d1---33836043753.pdf
    • http://aep-tc.com/cache/fck_files/file/25297388855.pdf
    • http://musorcentrum.hu/files/article/file/gasimulev.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075b6821caba---lawukapadag.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/d6b0761a07d9f0337fc311d1e016ac69/2734599588.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca34cee74a---juwadimizitabagan.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/eba62c2696a35b57d2dcbbad0a4a7cca/gozirebotelopexelov.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/37a9928158b9eb25b5a570561694c252/26806082273.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079344fc2e7a---1954076804.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/966194350d364ad1aebe559ebb0d2616/volosofagapupagaperasa.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6639ce6b7---lupunonakika.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745f200797a---sinevuwuda.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703299a1397---53367394621.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/e7413dcf8164fe93f2ffaf570429b529/84546828827.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=word+formation+worksheets+for+high+school
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e72d.bin
6f143b72c72abf7931960c9841007fbfbac3a0256df238a45d98ceba96a37d0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE72D 5392 bytes
font_01_sfnt_off0000f96e.bin
a36986e05502f833b370925d03f89109ffd1ea0a543bccbe8fa163a432e6ac62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF96E 10752 bytes

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