Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e64759afe983404…

MALICIOUS

PDF

85.4 KB Created: 2021-09-02 14:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ac5f6496a520ec0bb74585dac096e78d SHA-1: 3700645d354fc6fed2e87762bec765e6a12d6c64 SHA-256: 4e64759afe98340453a22633b9c7c7e06b22b773a3db564c97c7051340cc8093
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple PDF link farm heuristics further supports the conclusion that this document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=spherical+trigonometry+pdf+download PDF link annotation
    • http://graviroz.hu/ckfinder/userfiles/files/48849233322.pdfIn PDF document text
    • http://poliinc.com/upload/files/venanepote.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/56501207070.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/b0f2e31b79ae19290970b4e7d10a1b43/25767403057.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/fujimo.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/zebijudoboferetegiget.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afbbdc3203b---zizepuligodovitalumaxupo.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/batigetes.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/73461457066.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f6d950f2e2f73c854945eef8b49ecaea/juzogilojulefepafanotuduz.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d196df7feb5d6e876906adc935f65b82/27700696446.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/85005633847.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/37912134469.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/a60c6132350e8055223f03ee1d53a62c/lafuzonowopewebu.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/4tpnucsdk71pvgqg15b7u9mr40/50649415782.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/64404809965.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/pejugesojizozog.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/jofuvaxasiruzosilar.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb126dde46---sazosifefi.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/62a65cc15f720bd9a59c099dbfc13d74/67444919306.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/kotawepaxegonekefiriwota.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/6d329e12206440f6b29ccd90387026a7/petutip.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/gusetowul.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/bba3fc9119c2c524c350db81c1ab6318/zagorisozofotoxegiwuv.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_off0000e4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DA 18592 bytes
SHA-256: 8dda62bf0e74192fc9a7e8255fad780fb8c4ce78f7609ad8cf32f1b8fbe3f891
font_01_sfnt_off00011603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1A 11176 bytes
SHA-256: 87f0d64b25df7ec3556c895402c80e36512a53aaca49c11184428df4f7617f7e

Open this report in the interactive analyzer, or submit your own file for analysis.