Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6346d5e55c18404…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 07:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5f5481e794b34af78ab2d53349b6bdab SHA-1: ad91e7f17488a029ae2ae24e22df55f10ece76a3 SHA-256: a6346d5e55c184049bf1d34d1dab2abfbafe34cf4b75c0f3d5ccc80ffe90b701
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress sites, specifically within file upload directories, suggesting a tactic to host and distribute malicious files. The presence of a PDF_RANDOM_URL_LINK heuristic and the ML_NYX_PDF_MALICIOUS flag further indicate malicious intent. While no scripts were directly extracted, the structure and heuristics strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/93ohh63uerfrojhcldcqaffhq0/pewoxozuxibesaviw.pdf In PDF document text
    • http://www.logomarcanet.com/userfiles/file/rusuwetabokibilamodozivul.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/958bcfad8e84cb226a8b0a416ff32670/xizil.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/kesevokib.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160e3ff3dc80bd---27320708200.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/7ut1bp4pcuak8arkdlse1p5spr/telixeruwisisunadofa.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/garitederiwumamefowofidix.pdfIn PDF document text
    • https://dragulf.no/files/file/27043278147.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/makojanoxaviruvak.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16084841f79eac---45612754261.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c95888c53ef---fopepefoxebupobameregamex.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca109bd74d---98702057680.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/778e16e37af32b9c32115bd7d1c7cdec/teraxaresewukelos.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/savazidoxet.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/9fb32f487580a194667614b87042b43f/75165850586.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/82593875754.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/25248364137.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16088df6adb4ab---potewabopefidefuzojegi.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/volonujefewabivusapit.pdfIn PDF document text
    • http://odmooregolf.com/clients/e/e7/e7046aca88cfcc92de0be8f3f6b3de3d/File/vetota.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/fivarutuzamoloxa.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3fcb88dea---95609008298.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/kijogazemiralutufilejujuj.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114d1e08c9e1---49465072734.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/83940570255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=nissan+armada+2008+manualPDF 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_off0000da27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 10584 bytes
SHA-256: 76cd210a649b07d7329ac011125c7517f1f7b7f1d211f49f94d7f903b2e7815d
font_02_sfnt_off00010a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A57 18236 bytes
SHA-256: 3b7e7a5f333b3b8de3016466530d7ba013784ea14aed86d1a2226139b2077ed2

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