Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbcbd9af6da2f801…

MALICIOUS

PDF

91.1 KB Created: 2021-07-16 03:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8f2328b1f402022862cb7db84ae55ace SHA-1: 7fdfe1eee1373372c846872122a6752535b6f1b7 SHA-256: cbcbd9af6da2f8016f67d034371064ac503c15ac14f373218227456a3d90fa87
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of numerous links on disposable hosting and the use of UTM parameters indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7ca1b11db---rojuwute.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f91f200e9---52988887639.pdfIn PDF document text
    • http://painttechvina.com/webroot/img/files/mumurobudazuxol.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0543a2463---bifoxenivugusubewiwi.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/82783851853.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7b6c7508d---novodofokel.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c9a3a06c---29614174526.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/wekujezodojapakuze.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68a8360a2---nubinuto.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/68122596393.pdfIn PDF document text
    • http://mousike.it/img_ins/files/xefolipofodijenanubape.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/74880458742.pdfIn PDF document text
    • http://sns.hu/_user/file/rixajibabebaza.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/095dcb81303e575e2997bdde4d764838/najafagixopirenumikamibo.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/30216801134.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/29927099581.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/26664345304.pdfIn PDF document text
    • http://www.asslar.de/downloads/getogezajob.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/19349311193.pdfIn PDF document text
    • https://x-software.cz/data/file/wujodatufotavoxi.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/acb3e2cd704400e44c5b812f1d55579c/61927712041.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096c7cf091a6---66503807325.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/70b7de67ff5a458038aff85013143dd6/59717399103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=body+parts+in+french+for+kidsPDF 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_off00010088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10088 18340 bytes
SHA-256: ecbcc0a8909706cb681ac23c7f4d1e3ca7fff6c178ab8b17214d29b6913f389a
font_01_sfnt_off00012dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D8 10932 bytes
SHA-256: 6569c695377a198704839f9b92046a8e8c8a96be1b03da00b3040e2b2374ed90