Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e6a394b069b054…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 02:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c614297ff08d29752783ea240b2e6356 SHA-1: c38c1875039f2ba1f88eb26555da0244ee15a68f SHA-256: 77e6a394b069b054c38a387eaeaa73f4225b60112856e61629398523269ee961
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users into downloading further malware or visiting phishing pages. No scripts were extracted, but the heuristic findings point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://proxima-design.cz/files/file/wapesim.pdf In PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/b946d9bba2887123ab542096710c955c/60319146026.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ad2658f1c---wexif.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/42436947757.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098ba618d441---91924537412.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/8174277840.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/kijabimuwubasimud.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfae0181739---17745916807.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612359f392b12---nekugijosapomuti.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/bbd7247dff77ee9bfd97d2cc5730d3e0/zerewuke.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210517163822.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16083f69401242---93010675252.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/buvuzotuna.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/27303665068.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/komarenikatirobobox.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/tatefanezakinidikit.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/11692258127.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd55757f74---duwunaxavorewivotoma.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/99950355718.pdfIn PDF document text
    • http://e-district.org/userfiles/file/3776982087.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/201ca403415a43766f5bd1108e699812/wegenazevesovitov.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/46858692425.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/nniriombifncjbtrplqrsqnu93/dasekafatasijuxokumav.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/wusobeberupimemenusoxa.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/vowodeguvimasir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pdf+of+physiology+book+by+sembulingamPDF 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_off0000dbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFB 17276 bytes
SHA-256: 75f3ce14172eca4aa90ae89edf81450ae961507c15842f8cf7788a484baaa387
font_01_sfnt_off000107d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FED 11196 bytes
SHA-256: 228ae42a87238ebb86e7af7b0c10c8f4bbe8414fbcd15fb6735c73ff720c3561

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