Malicious PDF — malware analysis report

Static analysis result for SHA-256 af55cb6d57e6c0f8…

MALICIOUS

PDF

70.7 KB Created: 2021-09-01 00:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c94a7da574013b1dd49af4b41b71baac SHA-1: 6e6c22cea27a7db3bd273089411f491bf24ef93e SHA-256: af55cb6d57e6c0f8f17a74dfa99ee96ae5291e8a58b1e05395b3cfb83c522688
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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
  • 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://oniceh.ru/uplcv?utm_term=the+brainstorm+company PDF link annotation
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/dc1aa308844992fd1842f0747bcc6ba3/3778689433.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/q2u2mjq400878b6a8e2meo8aul/74240394783.pdfIn PDF document text
    • http://strandedtattoo.net/file/kusapediligaxi.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/83s345afbjsrbmf42mbm6sm260/xikebusoripokeliziladuton.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/7198566420.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/38503204355.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/cb91fbdfddbb940e4337a76d87bbbe64/semelif.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/5nbsn7mnp5bsjge6h2d0ujjs7o/24943426754.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/ggtt1r4nej8iob9f3o7orjf8u5/14769745971.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/wativadigididadaj.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/89083735290.pdfIn PDF document text
    • https://digireg.pl/upload/zogiwolijivikoradara.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092c5ab93c17---82473644272.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/7981636bfba8f71c8292d3a8cfc915cf/luxanogotijux.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/60359618093.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/werulafipenuror.pdfIn PDF document text
    • http://moneymaker-gold.de/files/jededusijalawi.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/35926710143.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160eda9f34ddee---74459620456.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/71886067522.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca37658c42---61150090113.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/oa617br52ct0rnndfo2g9rigkm/dudixisifire.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/logewifer.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9679795c568f0bec9d805483dee6d5c6/xusoxikuzivawejegezudibap.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_off0000b61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB61A 10808 bytes
SHA-256: 68c35ba85f200cc6469952a3eee86325d970dff8310b34205a190eef25476010
font_01_sfnt_off0000cea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA9 15308 bytes
SHA-256: 00811a81b3ab47a4228e0de72d919f2e426d0cc9d83101074b4aa10b3bf6ec48
font_02_sfnt_off0000f536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF536 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.