Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef27af668248b74…

MALICIOUS

PDF

87.4 KB Created: 2021-07-13 22:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 554c868cfee2d171218194f3637e1052 SHA-1: ce72ef9ad8e2bf45ed1537545334463a9c0ffe70 SHA-256: 9ef27af668248b740af517ea2a90cdeb59558afd8b76a173d2ba20b5a8f02b13
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/0b0edde9e64fe282de01c8c01d65c7e3/26089134849.pdf
    • http://fuga-hotel.com/CKEdit/upload/files/gatewelawafibasivumav.pdf
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/sezomezizokobisajane.pdf
    • https://shopabrang.com/images/files/kewokerif.pdf
    • http://bulk-supplies.com/userfiles/file/37530445013.pdf
    • https://bda.ch/ckfinder/userfiles/files/22721660514.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080ecf657807---41665037880.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d65158b5711---13318781434.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/taxukiliturokemafomedow.pdf
    • https://roweryelectra.pl/app/webroot/uploads/file/16258916441368.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6d577af32---nenuxuripaxatefatalaje.pdf
    • http://abwmechanicsville.com/uploads/files/1075769726.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b1c6ec4a9077fa93e454dcea81106c70/84361353059.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63c7099040---29659184931.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d325f14e700---fareridazedile.pdf
    • http://paitoonbox.com/userfiles/files/50136063879.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/jitijakawidepivunejira.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/dd82cf798e7f64f80f37fe206d735741/44496747848.pdf
    • http://brandiassociati.it/userfiles/file/pevadujikuropawu.pdf
    • https://gomaihoa.net/upload/files/20028848880.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a831c44e08e---wurafadosuxusovakodufit.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/657832484152b119e8c142aa0295b803/norovufozeruwiposome.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073567bb5acb---givinesusaguwilikese.pdf
    • https://btsis.com/upload/ckfinder/files/dogiz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=cyber+tools+class+7+solutions+chapter+3
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f394.bin
4a0c7f4b53189fb978821820ab0000829e709ecd4fbc974d0a7fb959758b01fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF394 11080 bytes
font_01_sfnt_off00010d3b.bin
d24a1b3de82fc917f961c8d96bdf3a026c1d987d7d579b82945a00d8a57ba173
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3B 16620 bytes
font_02_sfnt_off0001385d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1385D 16792 bytes