Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a647b55ededa04…

MALICIOUS

PDF

98.4 KB Created: 2021-07-05 23:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d8a5195a143e27fb6a54b616372689b8 SHA-1: c1eeef0d70e17d307e054b5bdebc1aa55f0bcb6c SHA-256: 45a647b55ededa044674a37400cb6ec8a0fd0a0dbd8421c7b56b9c9a2f4714a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many of which point to compromised WordPress installations, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure and URL patterns are consistent with a link farm used for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da4c84bae4---78008474232.pdf In PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608acb53c0260---nemarizu.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86032d570d---87226449265.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/c90cb376b9446853bf0d43d4332db0f9/nalosinelaxejili.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/t2k5f3kmif41lcur5fp2vatslr/82962039349.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c802f9ba5c---35237757829.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3167bdfa22---bilanuruduniribo.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/paxam.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16084f75b37b91---66098703740.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c4941b74abe---majisufanugizelagazinural.pdfIn PDF document text
    • https://arerp.kr/data/file///84255225347.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/88299490655.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/82961691711.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/gisujixedorazipazu.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4b707d2d3---18569378569.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb3569c2c0---37375309045.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/n5mglcpa6ciood78esmbqbcfl0/58526277466.pdfIn PDF document text
    • http://iltorg.ru/upload/file/kagimoj.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/vazimodokotidabases.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/aeca87380af7a02f0c6c02e4bff03aec/fipodamamumabuximexixejo.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083bca78cd78---27769881560.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/96556c003b9b47088b164d6db48cee7b/83189957571.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a5d3ea57f---favetiximatonanarubakota.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/lopuruboliwu.pdfIn PDF document text
    • https://gulyaskantin.hu/uploads/frontend/files/40185763878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=in+the+rainforestPDF 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_off00012209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12209 10216 bytes
SHA-256: 538e795d2893826752ef4305631f6973b9431c8a5c584086565cd43f5117f648
font_01_sfnt_off000138de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DE 16816 bytes
SHA-256: dbdbafaa6c2e24fc5ecf8aeda61e75bbb44631cf5d0e6442602b6da50899f91c
font_02_sfnt_off00016475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1