Malicious PDF — malware analysis report

Static analysis result for SHA-256 c018f8d47cfd0690…

MALICIOUS

PDF

72.2 KB Created: 2021-09-26 18:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0e1ef2f2a1b281fcdc3fe23ae1e143ed SHA-1: acd2b4db9078a042b446c861a7d76e024a23a616 SHA-256: c018f8d47cfd069094975da76a20d9101516eac4ba858baa8f21780053da5ea4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URI heuristics and link farm indicators further supports this, suggesting the PDF serves as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 https://coretry.ru/uplcv?utm_term=movie+play+box+red+apk PDF link annotation
    • http://santehnika34.ru/images/file/30795883133.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/8323179976.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16144271c2b891---kaxuzebokolixi.pdfIn PDF document text
    • http://ed-union05.ru/files/file/tisemoni.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/2861201841.pdfIn PDF document text
    • http://husplaza.hu/editor_up/21669137652.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/pativovutemulesazesimejov.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/85470805566.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/fizosaduxuxawu.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/34a739dce16bcd801d847a0c05ff3432/69553255524.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/sawovavexapulujaked.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16143a7898bd6d---95771940839.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/42260587547.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/68218393108.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/jelebamodarovosiliw.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/nomaxegot.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/95711698635.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150058b50d12---ruwizuropipokumozefez.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/zedubased.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/92138917262.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/fadexujomafodujisepo.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/zijifisuxigapokaferiw.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/29032808210.pdfIn PDF document text
    • https://clinicscrm.com/img/files/69430982038.pdfIn PDF document text
    • https://jotelek.hu/files/file/50108302947.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/57510716517.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d05b88513---61970614477.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_off0000b5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B4 18248 bytes
SHA-256: 168fe8ced290ecf4be2016f1df9e5c5ffca8bdbc40c0de5c14ef137ab0d2f554
font_01_sfnt_off0000e360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE360 10524 bytes
SHA-256: afcf29816400dd895de2ef85b977a7f9d155d4a83430ca6b3f44cb04c9c274d7
font_02_sfnt_off0000fb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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