Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9bc841e0e22b6f…

MALICIOUS

PDF

91.6 KB Created: 2021-08-15 08:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 0ce88b470743df9e228c8773ea47481a SHA-1: 2cb54f7b66e60f0e1d9ebe67edf41695a5b099db SHA-256: 1d9bc841e0e22b6fee41339d3bba9b4475a2ba5392b5899349f5420d38bb63fa
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of numerous links on potentially compromised sites increases the risk of users being directed to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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 https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e05ede868---xedawef.pdf In PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160983685dcebe---kekonirokoxag.pdfIn PDF document text
    • https://abeess.com/userfiles/file/5859863417.pdfIn PDF document text
    • https://eurotig.ro/file/46557539752.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba94cfbf4a5---nalivonasusukimanuvinof.pdfIn PDF document text
    • http://benly-carson.com/product/files/23273921218.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984766a3b8e---kakugasiniz.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ed1811f37bf---87065727335.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/vetipuzum.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/271ba166d6731a17ab96dd1b5abd910d/gimov.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/c9c3b143c08182276e0266a0e9d69ef8/kuponuvig.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/l3cd7divlg95hi8bar4k8r50no/wubobofu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083c6cbb0d21---76641386436.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/wofesaliz.pdfIn PDF document text
    • https://hssanesteban.cl/files/mamoluxuliwusatagop.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a07e14bb48c---dinewipodiludu.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a3e3dd15---zulalatetig.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/15681f9i31nck7hocmumk4ise6/61466858449.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/netakobovixavigizaseb.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202107140204575441.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/lokezupuk.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/52357548690c71f34cb15c8cfd75be39/11867722290.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/47682382027.pdfIn PDF document text
    • http://brunsfamilyreunion.org/clients/e/e7/e70b0594429ddd28dfd4dd2f61c76e80/File/17151442458.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b118d151b4---91182126409.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/bdaca01837f0fa57de24f3dd83dcd21b/kubodujukuxivefinapomafif.pdfIn PDF document text
    • https://digireg.cz/upload/52372171774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=carlill+vs+carbolic+smoke+ball+case+pdfPDF 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_off0000ffed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFED 18008 bytes
SHA-256: 9f8bb72ead786594db45e96ff884d1126bcb62bba5f1238cff4345af50272443
font_01_sfnt_off00012f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001471c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1471C 10908 bytes
SHA-256: e0abfda487278e6de6e4dbaa380b58249a22e0a90072569c7c6b2bf4a540736f

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