Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca80a1caa2ef98ee…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 02:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f59e35bb31c7719db7692bc28e985f0f SHA-1: 1d940ec1dff301a26ef777275608ceac147b5282 SHA-256: ca80a1caa2ef98ee427ec4f6618b24c5456cde517751a3ad3a9b042992a915e3
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The primary attack pattern involves luring users to external sites via malicious links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://kindeeyudee.com/ck_files/files/dipizapewuxizag.pdf In PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607af532e51cb---vagofudatazabonam.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/nq19u86vqi08a0lpdpchlk1cgm/mezovigiguworofedilapepup.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/254354901.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/xosomuwifanibuxarunixor.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/zezomikurusi.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/59917743909.pdfIn PDF document text
    • https://ka-base.no/images_content/file/95035691627.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608924d94d64e---vuvefapegowevureforu.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/tezizosom.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/36689673435.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/jadunipafefafovabesur.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/zerid.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/kimiwitopufiwuxevex.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e283038e92---dojoj.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/57035883653.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b4d92db4a---nepafes.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/632447dae407fd2aea9716944ea3849a/23978000635.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/98086881887.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713062139c7---xedinuluxerez.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/22339862948.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/mimovomali.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/59985341013.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46f676be61---podebezedokote.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7688786f9---38149002469.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/s79l8qj0te1pahgaud1qrpf34l/nesol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=nissan+march+sense+2015+ficha+tecnica+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_off0000dc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3D 18264 bytes
SHA-256: a7dfa081fea4bc1995838594661f7d3bbffd155159fb9fb9435da265672be15b
font_01_sfnt_off00010b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B99 11124 bytes
SHA-256: e95228ce3715e32482e237940e4febf59deb4909e8fb065d728bb38e75f91c09
font_02_sfnt_off0001257d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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