Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f742b2351f5f18b…

MALICIOUS

PDF

83.1 KB Created: 2021-08-16 21:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b2137b03bcb5de492a5808a0784409e SHA-1: e29f1d824bade6cc01cf4af32b8237d7d46b12a3 SHA-256: 9f742b2351f5f18b332df0c933d192da75e7477d53d64c7bb5ad6848a9ddd663
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/38317196482.pdf In PDF document text
    • http://asupuro.com/user_data/image//file/58864209414.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/11633324121.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/28923650197.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/74931feef7d8f4e5da09482e493dfe45/vofewizeja.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/mogabowur.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/2fba590d68d4c0e6e9d0b1c7c3f8669c/23348608914.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/9712424614.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/0f478903a5ccbd47b7d1be6e318d7950/sigojaxavimu.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddae5eb739a---gavifap.pdfIn PDF document text
    • https://fishuntpesca.it/file/depinapiwanidufud.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/xabobef.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/3bc1d3a4752b1af8bcb96bd286282bf3/81281868560.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/javelaturebikupipi.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c61b69c8d37---35415824484.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/67996533387.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c108b94d737---kiwarivitemakebapu.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/0a7662ba3c3a124fe1b5f7f1f0b75480/nidakisoguvimanoda.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/wuwasinikegokuwez.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca492ea7c6---zumuvuviravatisudagu.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/77713784827.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/m0bdn5c0tlm2aqnn13hdj1goof/84906686335.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/84583030162.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c5d8bffd5---dosenupujewazan.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/23858872372.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/61279259348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+do+you+reschedule+a+meeting+in+ms+teamsPDF 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_off0000de2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 11108 bytes
SHA-256: cfadc83653ff6016c3a618dd83b7406c882eb763fe551dd318de9aeec10b81fe
font_02_sfnt_off00010fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD1 17288 bytes
SHA-256: 2ea866d0019befa72bd112c64f55788d54fe5e743d3a968ed93bad140e3c3d21

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