Malicious PDF — malware analysis report

Static analysis result for SHA-256 353ede72a71a9e97…

MALICIOUS

PDF

95.7 KB Created: 2021-10-04 22:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3a823c82fbcc2c8dc6b59aff86d92dda SHA-1: eb481807afcab85db83caba2989b0315413aeede SHA-256: 353ede72a71a9e97bf866adcd3f6bc6b199c72aead1505c581308d10a7682930
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://pixomot.ru/uplcv?utm_term=time+and+again+nora+roberts+pdf PDF link annotation
    • http://bananamusic.tw/uploads/files/202110041938267381.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/052hcv1ed7lnt1t1tb0vpe6ko5/15338625691.pdfIn PDF document text
    • http://orthopediedelft.eu/files/kobugurununolutuxofu.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/lovedolalaxazexo.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/19944959270.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/zonuxuwudezepuzununodu.pdfIn PDF document text
    • http://christopherdallo.com/file/30363109442.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1615212db07671---sidexesu.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/59510399793.pdfIn PDF document text
    • http://bgindus.com/t/tutorfirm/uploads/ck/files/xujesimarada.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/82667968368.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1615b18e7a8853---jalinebu.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/19432373794.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/wuduvevubamawu.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/xipogabosuweme.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/joriwujebujefugusidajef.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/tupitazepo.pdfIn PDF document text
    • http://wenfengsi.com/wfs/WebFiles/file///2021091403134242.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/57792853120.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/vogiwidu.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/xarefo.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021100312303291.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/webugajarob.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bitujabakanix.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://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_off00010fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDA 19812 bytes
SHA-256: 8f56f7af43aec6bf681954875a139e84b3879401b59ea4c6d76a7c5eb5e54fc1
font_01_sfnt_off000143ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C03 10896 bytes
SHA-256: 130f6ac2e3fe68705ccb7541d545fc15adf68fccfe5f150d2d9f2e1b65e56adb