Malicious PDF — malware analysis report

Static analysis result for SHA-256 f832a11d4055a469…

MALICIOUS

PDF

84.6 KB Created: 2021-09-07 15:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8940d73e77d3082a6cb99652cfc73365 SHA-1: 860b0d83b10ac9ede5051b87fee94fd32a77953b SHA-256: f832a11d4055a46946a9c33130692adc464e5d8c3e6851b2919e4544be66927b
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites hosting further PDF files. This suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ce3b7eb27---47908593538.pdf In PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/1cfum95jm6fmnngu53jftl7mfn/61945515971.pdfIn PDF document text
    • https://robertbah.si/files/file/97589701284.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/9824220264.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/94090793578.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/64696241470.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6d9d0040c---80241633804.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd622fe6c---fefavimogulo.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/mitap.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/nagoguxevukulukeninegiru.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/29134783649.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/gloc8294o5t1m2jvvp3c0puueq/39030600580.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/5d60c150a83ea199134201dc162ad978/xunumanexe.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/44563524188.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/jolota.pdfIn PDF document text
    • http://axwelindia.com/uploads/penegesegopima.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/bexokutosubebinenen.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/gulenor.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/xuwejuzagerudejivo.pdfIn PDF document text
    • https://etadelloro.it/images/file/78300529325.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/b2d795a05067f662ace977952e9abd08/namegumigolasuxove.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/wosiluniripafemelaf.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/96408806377.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/63692505600.pdfIn PDF document text
    • https://webmenuplus.com/images/file/dusurewezezoxef.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/walixutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=flakiness+and+elongation+index+test+pdfPDF 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_off0000e2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FD 10744 bytes
SHA-256: 5493210a29e606d087240b3a812487b3f3d56694e56d45cfbe1ba89378ff0145
font_01_sfnt_off0000fb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A7 18712 bytes
SHA-256: 6567f54bd2503e3ffaad893f8a1f20d288e55eb2067c78add1404116fd2420d7

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