Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd91cbfec75d936b…

MALICIOUS

PDF

75.8 KB Created: 2021-09-06 15:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: abc2470512145ff40b81888b54e05f75 SHA-1: bc0eda85806a0660e0add2cb8a22d27d8a4a8dd1 SHA-256: bd91cbfec75d936bb1dabeee9b4971507e9ae786b52908736166a12ad67d69b3
176 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_URI heuristics and the high ML score indicate a strong intent to direct users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://moderncarrent.com/user_img/files/sugigeposujorozirore.pdf In PDF document text
    • http://baggiez.net/userfiles/file/32563504165.pdfIn PDF document text
    • http://24cvety.ru/upload/files/75713655119.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/36692914947.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/69214745007.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a66becb1d---87872398512.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/betinujozifeziriju.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/60739674571.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ad0425e7b---32431310577.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/59570910664.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a19770e3bef---gegusikoxunanosewagudozi.pdfIn PDF document text
    • http://bociany.sk/media/file/munamoxeguzov.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160826dc7905c7---56764204136.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076f6300dadf---48058448566.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/31215646867.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/84737421087.pdfIn PDF document text
    • https://ubranni.com/uploader/files/gudoxozukezaxapor.pdfIn PDF document text
    • http://willbramephotography.com/ribejemevavugedegikasuzu.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba97f622f5---bikidatoreletel.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/a8b9bd7bd2d03875f00a436b2fd03e39/97815900018.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd11b4f2d3---4418189449.pdfPDF link annotation
    • https://posh.hr/files/kujodapapizusonarovago.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/dc67207e1266975bdb541f3957d7d7ce/28141570739.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608596b2ab855---17329952397.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c526a3cbb---wojoladojexesamosi.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/6135b14a77549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=gujarat+samachar+vadodara+today+newspaper+pdfPDF 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_off0000c4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FC 11280 bytes
SHA-256: 49317cbd21e63793c964eafc59654fc391269af528f13bf11ee6e200936277af
font_01_sfnt_off0000df7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7B 16144 bytes
SHA-256: 56b858351d08796d7bc68595e88484339fa362e72b9f9542543a7ea2db7ee4b6
font_02_sfnt_off000108eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1