Malicious PDF — malware analysis report

Static analysis result for SHA-256 7faa728451b5e135…

MALICIOUS

PDF

73.4 KB Created: 2021-07-25 06:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ee2f3a69d0ef9b560e3eae31261dccd4 SHA-1: aeeef1e895bd24d49cbde7d68b410712fe481be9 SHA-256: 7faa728451b5e135b9bb993a3b6bab75bb6c6a9578ebef539045650cb9a3af2e
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms and appear to be part of a link farm designed to lure users with terms like 'pokemon x and y game free download'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9361

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 https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/7fqga2of1l3vf3c3caps7ss6l9/texonimok.pdf In PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607136e939350---21537704452.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///kikozofodejamor.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/duzilijo.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/17828688643.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/51712628280.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/9258if3ut1eh3rg4kj8outt0vd/89984752796.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/90895390364.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210722_6c1b9.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/sudefixetinabonuxukiw.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/4915795467.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/55117392863.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/5fcc1538b601a81efb7c98a2ba8d6f41/pedoxezugojifixawapaxo.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/chtus4ngnrs91qvidhal7duetc/87159555350.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076776f01fcd---50919757519.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/jqci43ibtletmct2ht1c5mi2en/31479103937.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/51090033327.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834e5a892de---54691702174.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/renarabubaganaziboroz.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c51c95a9abd---2375011037.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/42969821170.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb8329db8b---77002973274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pokemon+x+and+y+game+free+download+for+android+full+versionPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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