Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63d31e19197617d…

MALICIOUS

PDF

237.3 KB Created: 2021-09-04 14:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2445b2720669bc77756245b53a0dd3b2 SHA-1: 4f5afd755171da445334c1078223d67786abb49d SHA-256: a63d31e19197617d670fa75fe63bdaa707132ab5351c42d4c91fc5f861b15781
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to potentially compromised websites or unknown domains, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports the malicious intent by identifying links to compromised WordPress upload storage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9828

Heuristics 5

  • 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.
  • 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=sqlite+tutorialspoint+pdf PDF link annotation
    • http://thayloilocnuoctaihanoi.net/upload/files/vafezumupidijejowerap.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///vorujefidovoke.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/90637985133.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/98317810611.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/desovapufijif.pdfIn PDF document text
    • http://nprofit.hk/userfiles/50671067162.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/tevadoge.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16236059178206.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/poludebazoluwefajusasola.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07b22064f9---gosepedoxetegogolodorigo.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/54050407032.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16092979856a63---95859758147.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/91936070488.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607037c730f1f---dafuwiwaberozafegegado.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/7080389119.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c002ac3e099---bagifuvovobimejujisaw.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/50825925687.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/44583128481.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/75861078282.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/043881934d83972362a6b02cedf9f6c8/kokadoxi.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1952784445608c31fc7ef65.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/22531203223.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608534e367d69---bepotoweperit.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/090844012533.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a141f0e2498---kivuxutujukumafewamegige.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_off00033e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33E79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0003568b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3568B 21124 bytes
SHA-256: dfa138c80d715386ff3cc789ba31f2079ff7fdd2299894a80e346463224929c7
font_02_sfnt_off00038dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x38DBF 10812 bytes
SHA-256: c23bb0c0f5e6a9a254e53230d2c462b11c0761f6cda7abc2d097c29480a66dd2