Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0aa9bb2cf1da1c5…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 10:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 96183a3ba0c0bdd3b414d9bc6fd0ade7 SHA-1: 3695466b283fdc10874af0eaff177b37f1b0f846 SHA-256: a0aa9bb2cf1da1c54e4a570cdf7d43357b065821af756a2413b6e63885685d5d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and link farms, suggesting it's used to redirect users to malicious content. The presence of external URI heuristics and compromised CMS upload links further supports its role as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160729d0814575---33586352416.pdf In PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160bd99e8ea47c---71560142837.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/xopewuresugovimolo.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/70487697008.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/78634832090.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6b22115ac1e5bee77e98d09aa736b856/weratasonibomib.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/32050236521.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/22990488085.pdfIn PDF document text
    • http://plastikacz.cz/soubory/files/76074812103.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/kovivizidezitovulin.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/6f047b56c8959cc608bc75338672e1bc/56207868263.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/13dc95f1e2f52b280814ba3daaed00b2/zurujasazejax.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1626767934_b43bb370d1.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/xiwegi.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/koboramuzamivojaxime.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/17621535089.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/4b0bde162445538655cb5d34dde58b07/sisemozudujofenaduzok.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/setumewuro.pdfIn PDF document text
    • http://rltclassof1970.com/clients/8/8f/8ff9f19c840b982a6efda18ba8bb483c/File/punoz.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/66060373927.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/6a8290938bbb4b0003e2c1a5a3527392/wolisej.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9c9a19018---98567795672.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/rewed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=deployment+diagram+for+hospital+management+system+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FF 17552 bytes
SHA-256: 7f52e973e4a0d3f658a6f8974b23fc86ccbb937ec286cbdd4b003ec88348f055
font_01_sfnt_off00010567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7E 11060 bytes
SHA-256: 507c87acd76102f61286d7efe252bbde7ffb15434dbff64ee934d64c0e31b28c