Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce580975ee0b3c4…

MALICIOUS

PDF

86.4 KB Created: 2021-08-03 06:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7ab5f2bd3974c3abcc8d65556a510b92 SHA-1: e72c5187e74679b5056aa32f142695ad2d243be8 SHA-256: fce580975ee0b3c48a08e6ac76bd9f9465e6481a4c8472c9ab7ad096e47117b4
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 websites or are part of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to compromised CMS upload directories suggests an attempt to leverage these sites for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://studiobaliva.eu/userfiles/files/lazuvuvedopudufidu.pdf In PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a650cddd1c---56487714272.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16087438a83929---26020153249.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/vumonutimibixejidib.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/sijetuvevab.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd9fc7ab60---22255855928.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/f2tqqa90bncf40iecussi5se9m/6834719930.pdfIn PDF document text
    • http://smn69.com/clients/866038/File/11904869344.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/bd223aaf4cabd3c9e2124ce0e7dcbd6e/89197328772.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/33612440407.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d419d65bc6---lujeribuka.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ee89843065b---87386983558.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4cb3f37b0---27646872028.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161013f51a2e11---46258419926.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/72773437552.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/7b2e184ac2f0bfa1ce0a3b930851c03b/9177070329.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/42765478759.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/bofasexopowara.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/2ecb032708f293af94b16ca94c8692f2/91581445379.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/4544178394.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bd712502c---85942051095.pdfIn PDF document text
    • http://clingac.com/d/files/saxikimunawanabulelokot.pdfIn PDF document text
    • https://htddienstverlening.nl/userfiles/file/62093145951.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/ridule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=fisher+paykel+fridge+user+guidePDF 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_off0000edae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 17332 bytes
SHA-256: 233733dfa48f67a916eef0476de57475219e4b0a59f7a89154583bbce7aa14d5
font_01_sfnt_off00011b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B14 10736 bytes
SHA-256: 77769209c5d3b7289229d877e56db3c9f867497c5efd42a0fb5722725fbe5683
font_02_sfnt_off000133a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1