Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86c68515215d674…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 23:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2754614c72d81c75a2a9c0f820c74c84 SHA-1: 205b682565b2f245186f26fe76c09ceefcb4f3ae SHA-256: b86c68515215d674f46f0c5c6c7244ffc1c1182ea66fe0bcca88d88e25645c77
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a link farm pointing to compromised WordPress upload storage and other external URLs, suggesting an attempt to redirect users to malicious sites or download further payloads. The presence of these elements strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=pokemon+shuffle+ios
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321b1a07e87---xebozeli.pdf
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/xamezakunugotanewame.pdf
    • http://vitacanes.com/uploads/files/putalisog.pdf
    • http://nitexprofi.cz/userfiles/file/luwotusesejub.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/66052923656.pdf
    • https://barcelonacentromedico.es/files/galeria/files/47947202188.pdf
    • http://studiotecnicomartani.eu/userfiles/files/14907107691.pdf
    • https://duvanco.be/docs/files/67087934403.pdf
    • https://mepho.hu/ckfinder/userfiles/files/pijixupusujefibonidizali.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355a6f7bc50---xepimo.pdf
    • http://northcity.rs/slike/files/bowawolixi.pdf
    • http://www.enredmail.com/templates/files/idCliente_/file/vesad.pdf
    • http://matchonusa.com/uploads/files/ganudota.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/8b2050b293d743b7a50a705e57f53a78/69758884788.pdf
    • http://maezawa-jidousha.com/js/upload/files/51604611723.pdf
    • http://surmounttravel.com/userfiles/files/vojizudujanusazupedaro.pdf
    • https://gastriklandsbf.se/UserFiles/files/69092579100.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/07bd58d0d2f175498069bc99920cf08a/vodegas.pdf
    • http://denda.co.kr/ckfinder/userfiles/files/79194695269.pdf
    • https://tunhuaduytan.com/upload/userfiles/files/75672894787.pdf
    • http://oawebserver.com/piceditor/file/82037909224.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/8d520cfd42396b5a7a4ec186b9c6a852/29103243984.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEE 16792 bytes
font_01_sfnt_off0000f305.bin
2e701d562b92794286c8c7f3ffb17b2c7b3d9d187ecfafc9b0c941451cae254f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF305 10312 bytes
font_02_sfnt_off00010a04.bin
0a789cbbddd2ccdb54d128130cea481f288dbf628d2358c60e162d36f3f2cef6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A04 18608 bytes