Malicious PDF — malware analysis report

Static analysis result for SHA-256 512afb88596df064…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 19:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1591412caba70b280dac86f0442499a2 SHA-1: b1f9ae71f0b327344d99c6732425dae39e086b2b SHA-256: 512afb88596df0649f0aa7bf45b4b4373aabea2a687a11e5e66c2769483195a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links, many hosted on compromised WordPress sites, that appear to be part of a link farm designed to lure users into downloading a file. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate a malicious phishing or malware distribution attempt. The presence of a 'download button' lure further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=driver+easy+how+to+manually+install+drivers PDF link annotation
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/af264c11dc8c28dc043cdd84b0a17ca3/69845270339.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/47300938091.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a58f7c3aa64---zevejisu.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/9a01c996086b5d33fc9691fdeb880108/2780092540.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/nudotuwe.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/42b9cd300984b80cee299ceee942775f/zamipe.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160764bb19bbfd---82772131003.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/26098636386.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/d1e2d208da3718024a6be8c877d8ce83/gukud.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/pozofegatejapowerukajeb.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/l3fg3sv37vi7k1llo262jdmal6/83561533061.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/94396889482.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/renorowefulobijunolu.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/79862520130.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091eb673775e---malaka.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/disufuweworapanusowogenew.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f782d8450c6---netuguvusovepiravemope.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/sk0m9ecqbkj9ubpr80u5ki4098/35277232385.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/21524641418.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/63182685513.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/0ead15e518313d264dae0d1978de86f5/zazup.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef982d7ad5---fugadixebonukepepujomad.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/98351494444.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_off0000de94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE94 10880 bytes
SHA-256: 276169473514e4a14a9354440b16580633fbeacb8a1639257588942c284641d7
font_01_sfnt_off0000f79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB1 17732 bytes
SHA-256: aaf53bd58d9047cfdc6b5a53ab83fd9a58fbf817e39292f66d39423d839e2c9c

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