Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f651ec8d6aba5a…

MALICIOUS

PDF

82.4 KB Created: 2021-08-25 00:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6037d68f1ab8283a1e1ff3b6e90b3ea1 SHA-1: f3cdfe8ace91598d581cc5e3762fefcf60c4ae99 SHA-256: c9f651ec8d6aba5ae5f85dffb85352c039512afaa63c16aa56689bdc47c2fdad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://manavpublicschool.org/manav/userfiles/file/sovolifun.pdf In PDF document text
    • http://namlongprojects.com/images/uploads/files/42317693147.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/50c7b4cf5a2a6f578ca7d51cadb45473/wenuvenamiv.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/34851352428.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/vodibejisozaz.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608153ba71c8a---nufivaxajikurajulo.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/dinovuju.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/61e1ca7cd44092c653f05a3ee781941f/dexepozaduv.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/rupagejomifa.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/69j07kghmrrg4s2ecv0j74ikk7/22742371938.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/88841099219.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16081c80e24b73---tokogusetomovadowakakexiv.pdfIn PDF document text
    • http://atya.eu/files/file/safiwutomuzukasuvaribolu.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/5e3405118107ea94b034ca5c5d6d8f07/wefat.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/9441914036.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/4129902109.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16083d5ac7a323---fusomipevavujitesuvanivu.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/1fc0f920b396b567d720afd6d5bb3c85/88410851068.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ec00966cd---sixibabivipodajox.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075b89589751---64236731035.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/mobukaxejegoriti.pdfIn PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/xipurezufufabemagarabit.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/73113733980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=sands+road+picture+framingPDF 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_off0000dd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 17320 bytes
SHA-256: 2a2ccf342b9f2b7915504e9ac731474940fc2af0d4c6dd934b7d837894d476fb
font_02_sfnt_off00012267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12267 11092 bytes
SHA-256: 19f75022f967fd032543ced303aed648775177294632be7622dd0de5d8cebb15

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