Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c3ffab04308020…

MALICIOUS

PDF

80.5 KB Created: 2021-09-01 02:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e472a3d5bd7c37a3d6b8eb25e21878ca SHA-1: caca182a70e974a04419b3daf4f0195b4d036a23 SHA-256: c8c3ffab0430802096751a5773c4f7e37a5cd267901177a5fb0d6a7191461617
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting it's used for SEO manipulation or to distribute further malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/beba584dbb38d81d6ac9637784022ce3/lakarobupasutekomakaw.pdf In PDF document text
    • http://salkim.com/userfiles/file/raxofugazopuvasaxoditir.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/38804389130.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ac2808d69---virixusavozofonu.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xudasodevaz.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/4jnca1sqm76tgogvurgp14dn81/zuzupalegeve.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/a0b51c6a996876bf9982ac3e759930dc/vamugowuxorozekose.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afd3995fc2d---27490342532.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca0752ceb6---97072090398.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/53592630115.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607396069d087---kibokuvizifo.pdfIn PDF document text
    • http://mahnomenalumni.com/clients/879209/File/divenovusaxu.pdfIn PDF document text
    • https://amgaa.org/temp//files/99956800941.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086336c97012---sexevojugexugebovamuve.pdfIn PDF document text
    • https://serini-cloud.pl/uploads/editor/file/66506600235.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/h356trl4ljt3it4jvr8d32htas/galumi.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a25fbde47c2---sukuregivosivoruti.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1627045177rodazavosorujajalosuzuge.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021728742465492.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/2194381323.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/82182348701.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/96587311060.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/bofun.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8f1c829dd---94666366196.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/65846172623.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/r0pi5iettm0m9pirnufnlphneq/zujim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=learn+how+to+lap+dancePDF 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_off0000d58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58B 17876 bytes
SHA-256: c97d6cf66cbd70d92e328232f82772881902f82aa0d7efebbd382796e416bd4f
font_01_sfnt_off000103b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD0 10392 bytes
SHA-256: e2304d74933c08fab26fd14c11dd8c5f460f57ffb8c57a43b465ffadab0456a7

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