Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba6c24410d11ff8…

MALICIOUS

PDF

70.3 KB Created: 2021-09-05 10:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 52b44e510f59665781c64ae3513b9169 SHA-1: 475de08f513b6bdb2336a927ed84181217e6f7c1 SHA-256: 5ba6c24410d11ff879b04b50866925b07187dad78b745ea5f2325a8c14088327
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7780

Heuristics 5

  • 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
  • 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://kolaykanal.com/userfiles/files/66314730500.pdf In PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9ea09f9e7---65775901015.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/71252243451.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721f51b2fba---retukebirukimodijujekap.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ba666502914---xobogopebefubagib.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3dfb59128---kagetonagol.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/gqbgjovu92o4vvk3686ecdnf8q/29276270411.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210804_061727.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/38055363405.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad4c9998b0---wojep.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102522e91129---livojujutigalenusadawaxo.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ce5e60c3f---nukewunezatapofewifotigop.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/a8125e163b2d15d87d3b2b4e4f3a79e6/gatolitum.pdfIn PDF document text
    • http://hidra.it/ckfinder/userfiles/files/23964612894.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/jebap.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/84296430712.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/42210097118.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/291ed50b003141b098fab6cc9cd341e1/68630645968.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/bidozojukizediw.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/dufafogi.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/talafe.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/73142481974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=manual+de+juego+de+patio+el+avioncitoPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 10708 bytes
SHA-256: 21cc16adc4f5f2b043e525fb247da51343cabcaa16b9a4b6871b88a18ec0219d

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