Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ef8163dd77e638…

MALICIOUS

PDF

86.0 KB Created: 2021-07-02 21:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: f670578141b65853f82e098951d58e9e SHA-1: 4af4f255c3aaebc11ef9d6d06aec098df91b058e SHA-256: 27ef8163dd77e6383108949ec2eccfc144f6d8b670626c7b2ba417663fc33163
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites, suggesting it's used for phishing or distributing further malware. The presence of multiple external URIs and a link farm heuristic strongly supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://argentinaproduct.com/ckfinder/userfiles/files/30580339444.pdf In PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16074c8b0374bc---37801472.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/bdefe12b2107a2bb5dd1547ed4db3501/salamovafadef.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094951713178---deboxetasujuvazoja.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/95d0e44d5a957c7cbce900081bead0dc/newuganumuworatogegu.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/pep3l3qjn40tshk54dtl7fov2s/vimowivipowalom.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/7142906162.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021070122490073499.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/piwatakagotefolunirurejip.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16091dc947ade6---85283909650.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd47aee827---xakas.pdfIn PDF document text
    • https://notrepanierbio.ch/userfiles/file/rifunudewe.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-2/20210502064146819574.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/22292216984.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/vavaridezunab.pdfIn PDF document text
    • https://campermagazine.tv/public/file/fanodamifatimisimir.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/39269143589.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff16c5c4ef---lijepivojeno.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/n9u3k6tjl27903qr5vdopv2t06/keluwade.pdfIn PDF document text
    • http://zuche0551.com/upload/file/vudatuxiwumez.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160794cf8e7c73---12117423318.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/ac50d8758cc41b12c157580d4f881bcb/befapegererijaworuja.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608637adea2f2---wofenafasepug.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/5521950649646ab0ecbfed2a8c268401/gorabesofaxuvin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=places+to+see+in+south+goaPDF 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_off0000edb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C7 16764 bytes
SHA-256: e619863537dd730ba8255116b710b5305a06aab344f964e5642567e8df97e843
font_02_sfnt_off0001316f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316F 10508 bytes
SHA-256: 3286b705d93d05ae026a2427a9f36fdea84c2422e77cb8ffe7c488219a1e6c5c

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