Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6265fc7e5554b7…

MALICIOUS

PDF

72.2 KB Created: 2021-05-01 15:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e504c5d9243a6216860353c47b54742 SHA-1: e1c7ae0f044e1ed57bd87c3e3e786d5bd0a34a62 SHA-256: ba6265fc7e5554b78cf0768c3950d098cd80cbcaa6f09a81757a32625e03ed14
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external PDFs hosted on compromised WordPress sites, indicating a link farm or redirection scheme. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple unknown PDF URLs suggests a potential distribution or hosting mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8179

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 http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075871faa234---bemiwodapavosagijun.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608661eba2b59---jutifezetutigikedurexo.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9353d6d65---zigapux.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/wubojapisozigajew.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608af3cb41b81---liwovukirok.pdf
    • https://aartipalette.com/userfiles/file/29994824577.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/dj59gk4udgucb1lgeqjgulk7s6/lozifu.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746d06665d5---xisulezopubususorom.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/8fa396370a753246fb079aefac106f98/30562039462.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/655e64b65d72ed292ad11bbeb985e14d/nowiwinitalunoluz.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/55aeaeafd387c23dcc49e1ef1b278c72/97927141797.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/9eb0128c6f591e7fa90b4affaf2e6fc5/80857262591.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/gi4g0imnq1c492mku6prkltgeo/11063734029.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af60203dfb---38249474697.pdf
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/hrh40q24lscbrlpmkfjcecjf5c/foxazanagotejexurowekarad.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78dfdeca5---48330407679.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=hyaluronic+acid+ampoule+sheet+mask
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1b4.bin
42e9bb77ba9b194e8e035893721fd09d6f0312f7a95b536506111ce708951976		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B4 5440 bytes

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