Malicious PDF — malware analysis report

Static analysis result for SHA-256 7438e3f7fd113a22…

MALICIOUS

PDF

90.8 KB Created: 2021-08-01 11:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: abc62b311a281c4e2d29804c6837ce18 SHA-1: 2177c6d2b6d3ca796a85e3d83d349b969ac88646 SHA-256: 7438e3f7fd113a22f7ed0ead616ae4e686d0197071240b1f12327fff853dc07a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3a829483d---40945381417.pdf In PDF document text
    • http://allamericannursing.com/userfiles/file/7138124651.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/2fa5dd05095bee992ed2b287484deda1/dimavotolow.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/5b4e4e5b032516e1a9f2a72e9149f0d9/pasiw.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/64349747180.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898bfc3efc5---suvijojabavapudutir.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e8813ad3---40437733846.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609637e69e76b---61365904082.pdfIn PDF document text
    • https://zhansq.cn/upload/file/14400017898.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/ccb09dde8c7629b3fb61e72286ed5142/butadutozixefenidefane.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/8818115047.pdfIn PDF document text
    • https://micsys.in/userfiles/file/75848654844.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/24810405187.pdfIn PDF document text
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/gerepufolan.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/4479546387.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/lezisemimuzamuvovomiru.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160987b5788099---27491908938.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087668d7659c---vunikupevibowadowipidap.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/12659684394.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/xatewawibudafap.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/nutawer.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/xafurebo.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e49488e05---vuviwatowaviz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=discuss+the+theme+of+education+in+second+class+citizenPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E7 10804 bytes
SHA-256: 6fd0f25e8e7a309302ca62d4089197ec41514f53871a1bcfe9010fb654e09c9d
font_01_sfnt_off00010ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA2 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_02_sfnt_off00011758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11758 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6A 17036 bytes
SHA-256: ed83d2fb72e4a625c7170000d83caf81e10a957dcce72f1a4483a082c6166baf

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