Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b541fe8326a9b2…

MALICIOUS

PDF

91.4 KB Created: 2021-09-14 07:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b051b473222318e22ab37486840838c2 SHA-1: 73544993b196e3cf05ed31208c405c9d3a821951 SHA-256: 94b541fe8326a9b23650787b5334ad25fa396cdb87d7660b8c4fcc2b7688c522
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload locations, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://studioego.cz/userfiles/file/55686690201.pdf In PDF document text
    • http://pappteam.hu/userfiles/file/fariwamedisolomizolid.pdfIn PDF document text
    • https://mavibusiness.it/file/94208625080.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/44834582100.pdfIn PDF document text
    • http://yoron.net/up/files/88499217804.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/a67da9a0bf84e0663ba85a5a4cacdff5/wovonijisudesuju.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210903/files/20210903212137.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/56314590308.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/67421351201.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f620256175---92858925093.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/41968896580.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/50644869183.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/galikelusesizezepawipera.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/pavufibotuxexesiv.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/soxeranemusivid.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210901150014.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/nq6o22h6jg0hjto831btsggup9/wovajenasodaxariradarop.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/pinifapifu.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/tosisafoxodalagamajudiwe.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/78412534589.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/dakopi.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/puvuki.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/jerafapojabivowipexito.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=friday+night+lights+season+1+putlockerPDF 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_off0000f867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF867 11128 bytes
SHA-256: 9b2d2ad7e3902f38f840fb77fc93606a590a1f2bbbaa2559a89f75db0884e545
font_01_sfnt_off00011223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A35 20104 bytes
SHA-256: 150c6351dfecd18d75dd773ff931c8372ceec2f51670ca36d259f7b07ee470c4