Malicious PDF — malware analysis report

Static analysis result for SHA-256 413f6e2c14a83e33…

MALICIOUS

PDF

86.1 KB Created: 2021-07-20 02:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 81f887395dfd0f50b8b0e05c45b3d866 SHA-1: 4c5653af2799f4a0d2d76a567f79b6f08852c7f0 SHA-256: 413f6e2c14a83e3315b6b64099c9c6d0a60524e2e66562dcedb9b23218de4037
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common malicious document distribution method.

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://area34.info/wp-content/plugins/super-forms/uploads/php/files/lnammf8rduiq6olokqidait9f6/wadobaxe.pdf In PDF document text
    • https://ubranni.com/uploader/files/6498482806.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/73941945114.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/6303d756ab23d1adf173eb3a20d5fc33/83770256159.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/10125061086.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cb547dcc2---44960271139.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/06cee95aa930427a0eb78e0dafa72132/nubegivaw.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/9f44424bf473c26664221db531806398/kivofuxixuxo.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160eca95034d67---sesasepatabinakifigig.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/e499077c3a9e131e68306764c9af03e3/66435069098.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/suvajapubebujirazadetoviv.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/mekuxabejewexupedonone.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/62480a40ad82eca277939f477c2e868c/tejamirixu.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/2054h14i0ll7uo06dhsgkiejh6/fiwotesubesijag.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/876e03c0d8ff3c6e9e402da85dee8604/86483864585.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/0ge48d7bg8tavc67je8nus0qp1/nuxep.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f7e8c6bc9---radavofewuximajagijupinol.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/20d2de82d1f995ed6438490d76c53ad6/xajoxugiboxupojofaboketu.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/q635g84ltoops6j1dak7djeljt/56142992553.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a64d0867d59---fadoxidok.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160893ac591b13---54368788317.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/sunum.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/05b417a2b39abd0bbb0415807ef4fc54/12434377420.pdfIn PDF document text
    • http://techbis.pl/files/file/mivezowajevijezodot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=overweight+is+not+healthyPDF 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_off0000ec9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AF 16868 bytes
SHA-256: b3e039aa895a6b18893bfcc810eeb2c672fbe6486b56a78cba1b73dcf5af602b
font_02_sfnt_off000130db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DB 10676 bytes
SHA-256: ae97606137ad021a4a69d6876465d4c7e843bbc174ba6e0d55659736c58312f7

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