Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0a851c7f8bbadc…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 04:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a2a20674b890871dd4ce20afec5d1697 SHA-1: 1bc036d8c37420469fb98342c7b4e035264629eb SHA-256: af0a851c7f8bbadcdd4953eece76bf5f914b300d31d6058e602d4ec0be2cf24a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. The heuristics indicate a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/hn8e8kp0jrek3leb5u679rg0or/vodimale.pdf In PDF document text
    • http://soflocops.net/clients/81266/File/79306635891.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/59621409550.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/11313358303.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/dilawikivugazife.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecab059b991---47866729814.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/98238119584.pdfIn PDF document text
    • https://incense888.com/uploads/files/202108300450554078.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080de31041aa---najigamuvex.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09fab709ae---42060069902.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/volee5fh7ja5oueom078in7pat/73172229601.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084758d94400---bisosefimuvu.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/sovezugunararaza.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d53db8c3d5---76760326357.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/9905161755.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/beronopaf.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/latejiwojisuwifobefumidu.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/43468642073.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/747a2c01d5a671a9aa72916926c2c957/36935291615.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/17381514190.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/2159743944.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/n2fhm58id3midv7tovncrso336/13993358561.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/59004577408.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/vubugubetus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=calineczka+streszczenie+pdfPDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/96490075743.pdfIn PDF document text
    • 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_off0000d955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD955 10676 bytes
SHA-256: 4874f00e1081479ef9e21c1b9ebac839cb46a2e08351a9ad15bf472420ab3d16
font_01_sfnt_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 17204 bytes
SHA-256: 7099d612ab8963afc56a15a032bee63cb19328e3cf5aea0688152ed892e9f6c7
font_02_sfnt_off00011d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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