Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdacbc326850cd9b…

MALICIOUS

PDF

91.5 KB Created: 2021-09-06 16:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f80613d908003dfc5b8c90170594974f SHA-1: ae9f11d0e6081f6396b7f3f61de58d8a0b24ebc5 SHA-256: fdacbc326850cd9b3265d06e11dc00dce69f07714a2f19da514e68c0cd4d899d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn--pssa17sw71b.tw/upimages/files/85763492385.pdf In PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/8orbc53hq6nqg5s5cjgssj9ifn/83035643018.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/giforawiriginutasa.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/gomajuzapibewu.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/68146994810.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/65458875466.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/44977848074.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f44a180e4---tejudufipukusepuwilud.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082a8a1431be---35162963604.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/8233769b80c58e88b7b728e91bb54c60/fulozopegosotavajikofeguz.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/161217d6693c32---wefetijitunozeb.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/b9b45f85d4e9af17fbe1890d7681ba31/togitefo.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/3c7009fa6e76b5d3cc9ba5d8adc52137/sepirixefefuwis.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/bafa37add145559d72f1fb8ce257a827/27632140255.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608633165e5f3---dupowudugiwudezesevorawa.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/57687898279.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/galovikatinidu.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/98635183695.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/jukabumepuviwum.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vubivubupumiletusenos.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/jl1stvlrn6rlnulklluni29qs0/kaxad.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ff52ea6e7---53913786280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=proses+pembentukan+plak+gigi+pdfPDF 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_off0001010d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001191f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191F 17260 bytes
SHA-256: f6c2e1fb5f68f30182f7b6424a9f81441209e8b452222d85fa43269c7172c4a7
font_02_sfnt_off00014650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14650 11176 bytes
SHA-256: 9084ccffbdae1d34847db5ff0d9ffc9859f0446830d7d81fd8fc135b174dfdb4

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