Malicious PDF — malware analysis report

Static analysis result for SHA-256 baca149f019fb0d2…

MALICIOUS

PDF

66.8 KB Created: 2021-05-18 17:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7779098edfbd72427069959508f523c7 SHA-1: 5eac5b64fafda7a573f7808509a7e53fd92b0c44 SHA-256: baca149f019fb0d2b3c5aede853c2c047daf30d265db0714677822860f707cc2
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host and distribute malicious files. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7785

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://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0cc8677c1---pewivudibaroj.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/lc7cq27kvf1oeos3tb55r417l5/wokokawopiwelexune.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d501cb9e5---pugevekodaje.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/fc4a837a4892858682910625473e28ed/xuxuzabetopa.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609647a611a7d---19293950354.pdf
    • http://matstravel.ru/userfiles/file/25360316508.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/9mon716a1blq9qg98tkj18mvf6/vobafikanibilujopejuvu.pdf
    • http://akkoryazilim.com/userfiles/file/43716250589.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16079090632c29---94264612297.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/16b8864b0669b901f9f45d09c7134a6a/32372234332.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/bf63ebb718d549e422925284849c2569/44003879688.pdf
    • https://unserbiokorb.ch/userfiles/file/43898858953.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/2139db633e296a4e0b215830abb8515b/fopevusanaveposonifo.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/hp4pgd99f2250sbfrbvfdv9ic0/53746414294.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070092d2b64e---32369830122.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8cdb70a23---86828251350.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0b03e4bb2---95029079196.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=har+taraf+har+jagah+video+song+free+download
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5d2.bin
cd96bd8a0c62bb1afd664d3c438b7bd4fed3cb72d144cec3cef3c5f453c78718		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D2 5144 bytes
font_01_sfnt_off0000e762.bin
4ea314a7c9c1f3badeb1219683b5d1ef7d1059ff68f7be8a35e324f95d4b5564		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE762 10188 bytes

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