Malicious PDF — malware analysis report

Static analysis result for SHA-256 93335ae1c5c7d9f8…

MALICIOUS

PDF

116.9 KB Created: 2021-05-20 19:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d9d0fb085db03178797180926f6ca8f SHA-1: 5427a2ab670fb5dd7b3be695e540e6ce4c3892a1 SHA-256: 93335ae1c5c7d9f8ddecb157028fef69fa2060534e1228a29dac47d097573954
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to potentially compromised websites hosting other PDF files. The presence of embedded URLs and the nature of the heuristics suggest this file is part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9545

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://macautemple.com/userfiles/file/bipizibumolasenepawap.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/fc2ec8ad1263bf959d099e2e6f54d126/bomikoxixusimes.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/dktt7lkfucou0l5o3o4t4nj0i6/dewufegazavafima.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/892615ca92936cc067b58a4e0d6072d8/78690526140.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/4a564d6300dbf3278170629a512ef310/23244255610.pdf
    • http://analogsys.com/uploaded/file/210385714060a657055303c.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1c1ca268a---nezidekubakorukitofapawib.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160772b3253fd6---84827022385.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/d5b2b87fddf898875bf727d85edf25b3/sowapogilod.pdf
    • http://allmedicus.com/userfiles/file/38777159360.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/b1c7306dc9b010e8f0371e7f56586ea8/22619550580.pdf
    • http://ergo-logo-bamberg.de/userfiles/file/tedixabokudenad.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/kf6j44cb85dpn6rhetu2jvcbr6/ruridafutuvozejagiwade.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a23aa4c71c0---fakivovugiruwafat.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/3ffda958f034bedd93ef0dec0535bdb8/mimamipuworilepumizofu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=apostila+banco+de+dados+oracle+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019f5b.bin
d0eb25906c7b470cd2a5f6ae56d8ded23c1687bbc1b10fab90074f8169cc4b4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19F5B 5064 bytes

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