Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc97cef829dd7c45…

MALICIOUS

PDF

80.1 KB Created: 2021-09-05 13:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 34e33a4ab46d3338c649a9cea8d16c0f SHA-1: 419e87db5d0355bf16aaac7c8280ffad7be66f39 SHA-256: dc97cef829dd7c45de2013d99caf13420cd88585cc82a5352cac79961c972ec7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm and a potential phishing or malware distribution vector. The embedded URLs point to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://philabc.ru/uplcv?utm_term=delaware+annual+franchise+tax+report+form+pdf PDF link annotation
    • http://klubbelgickychobrov.sk/editor_uploads/files/27726340289.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/6mrg8s119irig0hgrlb4g5l212/dixujolosanoxawonukugumu.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0ecc03735748b54d883dad4084192a61/83026353727.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df31bf778e6---fonexapuxorel.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/kuremovunoso.pdfIn PDF document text
    • http://vhshf.de/File/34485790010.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/gutesokopivesigubeben.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f065cf2c8c---muludev.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/32000640874.pdfIn PDF document text
    • https://12shio2.com/contents//files/lakatobixasupofixugival.pdfIn PDF document text
    • https://go2germany.ru/files/file/80840622133.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c985baf0---62787379083.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a67f48649a5---xoboken.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/98086099550.pdfIn PDF document text
    • http://farmina.ru/uploads/files/95256432599.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/86467735190.pdfIn PDF document text
    • http://millecolori.it/images/file/sebomarowubina.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/peserukapuwilak.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c264172c07---zaxinuwu.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/limopoxapo.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073354e77387---rewewi.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/jokigukolokixuputif.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/68854105951.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/nin624n0kp22g732312cgbc00h/xewukujafazufidok.pdfIn PDF document text
    • 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_off0000d34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34A 11172 bytes
SHA-256: d578d2e09b7ff0e08364ad924b34730cfab19f6dab04e811451406681273643f
font_01_sfnt_off0000ed4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4B 17708 bytes
SHA-256: ada142d950da3b41dc58560f850f248046a0c1f3d8a1eb295c94ec9f106f9b30
font_02_sfnt_off00011aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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