Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ad499013a1a5fc…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 08:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2a5397a8af6267d3ce62379556cd3110 SHA-1: 09e0207c38f788dc0e30cfa1ca10dbda61e28a24 SHA-256: f5ad499013a1a5fc81a300d5408da5208e1e4c64edb557b943c98b545f9e64c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://philabc.ru/uplcv?utm_term=solubility+rules+chemistry+pdf PDF link annotation
    • https://beauti-full.ru/uploads/files/duvov.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210817042014.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/88345753107.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/288r6rbkhi5kkhov6sfnqsn146/16657831064.pdfIn PDF document text
    • https://murten-hotel.ch/userfiles/files/luboverefopegoxej.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/72837678753.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/sexezusepupidufumilusili.pdfIn PDF document text
    • http://gibisch.org/files/files/84502113197.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6f033ebc0---setidatogeliripepasus.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/metejafexezozatisajofiba.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f42f1b3f4---21527845572.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/j7irm7li7he0t2confp9pmpd5f/fawabifasagigozotor.pdfIn PDF document text
    • http://effektfilm.de/files/file/zedebusafozuxisu.pdfIn PDF document text
    • http://alhs1973.com/clients/64426/File/98539491334.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/832355ac7734f3e7a501ed162e1a4070/mejeto.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b0b39d977---35184063736.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9412c62aa---tegipatot.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/6a2b13604bbbe984d5dccaa917a09746/tarorisubuzitexafa.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d9b8d9330c---3214207149.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/duwepu.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/3430625124.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/25675985516.pdfIn PDF document text
    • 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_off0000e0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B2 17924 bytes
SHA-256: 13014c81b132f179d8ea82a85471ac9e64e4bb892fbf751d5b48836558512e91
font_01_sfnt_off00010eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAA 11048 bytes
SHA-256: 894cebd0ad0f1e66a87731d987c30b3f46f1197b2e3e882eb14b41f993d0df37
font_02_sfnt_off00012835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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