Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51ecab17ac558e0…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 03:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 26d0f49b6b23ec77765559a3f10ab3fe SHA-1: 3f7f720e271d92866582882df6ef1f39142357ee SHA-256: f51ecab17ac558e00dc03e76b1aea26c22ad44e1e1e6ef8c700d1b16807812c2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lead users to phishing sites or download further malware.

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://pixomot.ru/uplcv?utm_term=equivalent+expressions+worksheet+6th+grade PDF link annotation
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/hpb3v24qt9n6qpvf806j9amv23/51827178500.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/rubefipiriguwavu.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/39512878351.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/gosefekelagawenejamivoni.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/am3kc6139r3385hlmbt75v2nh5/voziruvelajaparupoxizize.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/wovovorokexerumepefe.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098bb9a40be8---miwaxazuwog.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/53880554577.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/66552233936.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e86ae2f25b---dexizajomufabaxoja.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c087db61b215bed60afe73b5a129f27a/71332893898.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/44213520589.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795e1d6db0b---75822533598.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/lokefegaxejirikoxulifag.pdfIn PDF document text
    • https://luminex.pl/upload/file/gogosalofimoxumag.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4edd71c2ac1db87b4c72edd7a9430708/nujani.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/ec669512825fd113c7e9d59c6c78c7b8/mobugipurusu.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/39763854246.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/26a4c912d5b259035f459a190a077400/25480822041.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/wegisuxalidoxen.pdfIn PDF document text
    • https://petek.biz/resimler/files/97523914489.pdfIn PDF document text
    • https://samowar.ch/upload/file/voragagiwuliferajit.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/55357975533.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/7500a91cd1dcfdb155d40d5cd3341c76/texumazerupivomiseziju.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/nedejimava.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_off0000d65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65B 11412 bytes
SHA-256: fe6ea5f86114d9432da1702c386d4f8a43b34c5d39d51fa9811048c647c72668
font_01_sfnt_off0000f0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CB 18744 bytes
SHA-256: b3cd44b70c78ec9c8f07d12ce72dd39827633bbfa73df3ce98303c7030da1e76
font_02_sfnt_off000120fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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