Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf85987f5c79748…

MALICIOUS

PDF

75.7 KB Created: 2021-10-01 15:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 08b2b0ea18f723b7361fc35384722f2f SHA-1: 4234d9e8b67cc37a53e91debd7bfc8ceb10d6312 SHA-256: dbf85987f5c79748a6e7fbcbb7ee9a627298309b2f7fb9a163d7137a9fa1ea74
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 and numerous external links, some pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://eric-parnes.shortex.com/ckfinder/userfiles/files/520626165.pdf In PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16152154d52988---21904812065.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/32974434345.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161338fe18799e---68196963707.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/94010343387.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/julaferesemelufuvu.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/h68c6gqm4hr8lvs8m1976k661i/55006839039.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/90300291777.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16139952ddf054---lovakerumudiruxulozonavu.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/0f0fc2d4ee27399cbc0532879561725c/divumokavipixaboxupejo.pdfIn PDF document text
    • http://hjhchem.com/upload/files/57952913046.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/mebopanigaxonezu.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/21181299894.pdfIn PDF document text
    • http://identik.hu/editor_up/90575783620.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/69323356184.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/zusumikiwa.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161543e7e51729---82794073534.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/45764250826.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63f2ffe5d0dc454c6eefb034f8e49c72/vitexubixipelejuxuki.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/92842194835.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/27301266544.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/37848648186.pdfIn PDF document text
    • http://germainelecocq.it/userfiles/files/67899540448.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/dn9svri1bc5a36s0aga9gv828o/wefetalofatokerukasupatof.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/juxuvipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=followmeter+plus+mod+apkPDF 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_off0000bd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1B 10612 bytes
SHA-256: 0fc5907ea2685d4b60214bbe1dd209be2b6ac3bfaa2a91c51a46ae6805720ed3
font_01_sfnt_off0000d575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD575 19800 bytes
SHA-256: aad38206f17f4825194c8e5bc74ff127159593b83f7fffb94bc04bb0703b21ac
font_02_sfnt_off000108c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1