Malicious PDF — malware analysis report

Static analysis result for SHA-256 87947ca691344be7…

MALICIOUS

PDF

86.2 KB Created: 2021-09-07 07:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 73cdedb28b5194871852b7a0c9d1e616 SHA-1: fdb2ed5a4c51822b0d86665a528bc62e83525a65 SHA-256: 87947ca691344be79e41c586a16972bbea6ee7248d0aa0bb7b29d5dcfda3f06e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to manipulate search engine results or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://finvestfortune.com/admin/userfiles/files/vodugozefew.pdf In PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16118b2c8b552a---77567241072.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/36528853260.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/36446221573.pdfIn PDF document text
    • http://health-bridge.in/upload/file/nupagezabomuxutupowemusa.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128d5d2b6de4---negefipupemakito.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/a04c1dd277b0b54cc272f42cd10f17a0/12209484620.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/avds2e5s7opudufsg30ugd8dpi/mezexopefusaxelopavolemor.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f231935a8f4---fesalujopowunejaroj.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c261bb227d8---15224733305.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2f587e21a---veronefexesexemelu.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/sazororen.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/68486532935.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbf900240c---dotekixelopi.pdfIn PDF document text
    • http://specimport.by/files/files/60821100974.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///2021621140353136.pdfIn PDF document text
    • http://miracleschoolministries.com/survey/userfiles/files/wolojazesuzuxigojuxifufa.pdfIn PDF document text
    • https://digireg.com/upload/rerukodanexaloserigidego.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/u965lalmqrumo3iuu0m0d8ph3r/88058805286.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/9941ab29ff8dcab7cc9ca34178e87c35/gowuvoguwozevuroxopif.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/74554435064.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8d077377dee66408c3a49b581cf16761/78301666856.pdfIn PDF document text
    • http://salkim.com/userfiles/file/sudog.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161213c98f3628---bevapulogunidefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=directional+characteristics+of+covalent+bond+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_off0000e8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CF 10924 bytes
SHA-256: 7b9f2936df801ee037d3864790a9ad48d0dfebda6ab976725b378de555c587ae
font_01_sfnt_off000101da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EC 18632 bytes
SHA-256: 7b830b99fb44fed05f6ebb26f9007585ed961bbb2f301b5d039ff06496363b8a

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