Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb4e65d36c3deb5…

MALICIOUS

PDF

80.0 KB Created: 2021-06-27 07:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15930ecbde2b1303c4fd6f1ed888413e SHA-1: 72f96a13e1eed728cfd494ba903803f410f740e1 SHA-256: cbb4e65d36c3deb52d34bfc9f9fe2a230130d32c539bfe479ce9d885e707bc7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites that host further PDF files. The presence of external URIs and link farm heuristics suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6c75e1b68---lemotefekoguvigulalap.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/938d1dbbb2c7b711bc0b6a6201d2450e/55257462891.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/e4ea290f424597415ca499c9e7291d73/guxeweromepuvogevifo.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/26595c9d17ea8f437548d2862d35c6c3/530043443.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd4bbbc711---bitevezufafiga.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/mqv4rireindahu0sbae6i37ic0/jegenufunovamoris.pdf
    • http://thuduchouse.vn/pics/file/18436982009.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6d40205b6---87077089295.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075eb0e01152---8112409919.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16089f19be0f73---32498238827.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c134ed3f28b---xulidul.pdf
    • http://x04ydivan.ru/userfiles/file/60300822892.pdf
    • http://truthtube.com/UserFiles/file/2134422989.pdf
    • http://polyalpan.hu/_user/file/90519153213.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/e9fk7ridsc760r67sg6c0pnt8t/53073180509.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160848b01c0879---nedeja.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77fa0f0376---wititeka.pdf
    • https://bookatowncar.com/userfiles/file/77088652254.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/8faul2fnqniht22ce1upot4217/61312461158.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb2989ca1c---74668118081.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/dc2f86cd88e6637ce658fd2aa1954207/tepedixojolusaz.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7f1fm97s4ifm7t77dtg72skb41/dasuluvedu.pdf
    • http://614move.com/clients/4890/File/1743434059.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160944ec881295---fudumejurujivaxub.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=singular+and+plural+activities+for+grade+3
    • 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_off0000d1d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D7 16792 bytes
font_01_sfnt_off0000e9e9.bin
76cb5298ca439838e98c47416d0ce45dd6dfd4a1964e050ec81c0abed7cb262a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E9 17456 bytes
font_02_sfnt_off00011657.bin
4a4aa2d998b447a9c2ab41d26ca2174ef6051d1f5be0c7836bbf9d6c3afc2d71
pdf-font-stream PDF embedded font (sfnt) at offset 0x11657 11208 bytes