Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c10421805609e0…

MALICIOUS

PDF

61.6 KB Created: 2021-06-21 18:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 13169e8dd60b6e67cc40a91dbd0e0a13 SHA-1: 1b45ef50b440f4e6917c0bc1a278c79f067e7808 SHA-256: 31c10421805609e0e9d0edf5119fd86f1307b2b577edaa161291a97569f7eef7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content or redirect users to phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9612

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b98d3a0a3---22557237060.pdf In PDF document text
    • http://jonkmp.nl/img/cms/file/76053558855.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/17537895623.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/u5nu308ptd6o4euc087a0g9ku0/nutifudopibasuxotoxe.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b789366043b---66629983182.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/pefoxasajesajodukibuwem.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/22260857223.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c1120651---88476606424.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/kizewawutowumupabokejus.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1a9b04e72---80255361839.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/93471850327.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/kigumugeva.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/95361512889.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/r1gptqugddqk35lrh5pmhlr1vl/xupozezavedetejomar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=need+for+speed+underground+redux+downloadPDF link annotation

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C6 5064 bytes
SHA-256: 23eac59e0832ef2ae4d099cf54e774fced3ed25a4e4d1bbc16e073a6767b716a

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