Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c2ddb449235ecd…

MALICIOUS

PDF

74.4 KB Created: 2021-09-10 16:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 95970c3ddd42f7b9dfe501554ef955d4 SHA-1: 114fda5c227502cdf9d375e2399271dd34aa23b3 SHA-256: 52c2ddb449235ecdecc944513b6aeabafe17bf7148b73e4727f20c972282ccb2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains associated with link farms and potentially compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://frickcontrols.com/uploads/files/65221185013.pdf In PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-9/20210909083247134097.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/kurasitatabexufiref.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/josebido.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c2e8c07f5---11208542785.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-09/064c0fd39846bd9a21075101ceec9f24.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/37852664097.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/vobisitanigedulenulenut.pdfIn PDF document text
    • https://grandegroup.net/files/1631930120.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/6d4adca03d758870fe08b643fa529980/51291683541.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/vovagopawarenexojima.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613985eea3445---96137081529.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/74887901420.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161318057e636f---91175096162.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134083a26d43---sumodosifitawipor.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/sarevuzukubimabikuderu.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/zagofedokolisejowixuri.pdfIn PDF document text
    • https://papiratisk.cz/soubory/47111845545.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/wixifozupozelasiwupesa.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16138d2270c7da---likijuboduxip.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/kuzejagezajinotopem.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/11047890426.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/95471641556.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210901225001_y7by18.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/mtlg1ati2qa6v2734adcstlghg/xizowelunubigoxena.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/vijarirugopoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=reset+proximity+sensor+androidPDF 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_off0000bc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC79 10768 bytes
SHA-256: 05b97d04ea6b45adec40fc71c0463ae6991b3c2d617e9dcb3c1e5eeba34db7ea
font_01_sfnt_off0000d54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 18016 bytes
SHA-256: acbbf39adcf072b57191e2b4b02cde1af5d1bc105a35c51fab22ae9013f83536

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