Malicious PDF — malware analysis report

Static analysis result for SHA-256 941bb178eb87db35…

MALICIOUS

PDF

81.1 KB Created: 2021-11-22 17:57:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-12
MD5: 9774ef99ce499c2b7c00cd850e19a8f5 SHA-1: 2c9f8c02386d4de46d495c27a2da6d6ee826533c SHA-256: 941bb178eb87db35b0dd9d31d8710cb50ebf62c5f0d21eddcdd0e4cc59342039
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites or disposable hosting. The heuristic firings indicate it functions as a link farm, likely designed to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript potentially executing further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=cow+pe+essay+in+english PDF link annotation
    • http://stavclearing.ru/upload/files/lujilemigaxutepamuvuv.pdfIn PDF document text
    • http://rayer.cn/d/files/jolanusomalapagimaledamu.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/26755764468.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/b82505339001a52a7db80de4f372666d/27679315535.pdfIn PDF document text
    • http://comac-international.cz/userfiles/file/venejewodugivevewuto.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/83019940688.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/068e3487a7ce8109c9cdd6d2659cc5de/40849058140.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c72b0a8f77---zinuwemaxenatejojekalulip.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/jonipejaf.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/66276225400.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/72794847319.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/zamub.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/lapibe.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/jonuza.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/garoxenipa.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/41033872955.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-6/20210906092027658053.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/mozunibajefaf.pdfIn PDF document text
    • http://stattus.com/assets/file/58265378069.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16159176a803d8---15773195723.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/88307539781.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/wuvutilobedubotepese.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210920_152741.pdfPDF link annotation
    • http://nguoigiupviec99.com/webroot/img/files/90379857636.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD017 1676 bytes
SHA-256: 2938c8f7a4ed5b522e10cd39c007a95db74a93fb5a58bad308adb85ae4553438
font_01_sfnt_off0000d804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD804 18192 bytes
SHA-256: b797d5c8b328537498f9755eb16164ecf1cacd56ce659ee6ba4e21845a1fdc3c
font_02_sfnt_off00010778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10778 16416 bytes
SHA-256: cfa2c3fbce80cc5607e01af033b793d17c57c214fb1d96e845eedea48cccd336
font_03_sfnt_off00011e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1C 10564 bytes
SHA-256: 7fa25cb8b009f34b35348effdc4a6efe89932fb52793caf25d037561d896f594

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