Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b40f1c80301dcfd…

MALICIOUS

PDF

87.3 KB Created: 2021-06-30 13:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 971f306237b9ef88394f5d4791af3ca8 SHA-1: 70ab19d4b6343ad2f8cc1505a1797aa18d83d095 SHA-256: 3b40f1c80301dcfd916f74af7c725510d2eaa452464df0c35e038fa1edf49f4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of links, many of which point to compromised WordPress sites and disposable hosting. These links likely serve as a link farm to distribute further malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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://haps.company/wp-content/plugins/super-forms/uploads/php/files/b2g83vau79gk543tslopgaeq10/bikifanuzubuketukepapow.pdf In PDF document text
    • https://boyanbolyarski.com/userfiles/file/36414359371.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ctkcb01jaqmbuueobps5onkik/71760940111.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/57377517426.pdfIn PDF document text
    • http://uci.ir/userfiles/file/lenorulufovovu.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/nukizokivasav.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/56360361459.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/3409fcdc4648f44aecb18ae1d39a8521/jenana.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/6c4ac3digoeqvcsktnrab4a7pu/zexopuponewonudi.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/sopavugajugu.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/7468d31a96d73a072e7db65b2081fb0b/20652858906.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a24d0614c8a---71014425226.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2391ba215---dutifipewi.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/bapumakegaroriretejiposa.pdfIn PDF document text
    • https://mszukam.pl/dat//file/jumifusexomaboletureweban.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/b4ce1f524d789293908d55fb119afbe4/wamemeraforu.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/balipon.pdfIn PDF document text
    • https://loctra.net/userfiles/file/zafodaw.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608440cad129c---lidodebi.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/8211ae74f1932fd805458f1284f78fc5/megetoxibiwilapobiwugaju.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/tegegejasajolekiwikiliwuj.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/21ab2a04544115899cf74aa03cd69c1f/26446540042.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/91503353583.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/6ca63dec0c332c42bc3c3bb612ab5915/11953428719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=tissue+science+meaningPDF 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_off0000f45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 16944 bytes
SHA-256: d751cca25916df3136ae654553e9bc54677cea5b3763f0856019634a9de4adf6
font_01_sfnt_off0001209f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209F 10272 bytes
SHA-256: f70524c392bed3f9f205b37b2aff8149c1b2eee6eb234cef69d84bcb3c954426
font_02_sfnt_off000137b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1