Malicious PDF — malware analysis report

Static analysis result for SHA-256 291fbe93c8853a76…

MALICIOUS

PDF

92.1 KB Created: 2021-09-04 21:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5d969190267f9a41854f3a83bdf05e37 SHA-1: 0093e2e0dc02f1a7aafdd976eb749f6fadf9a7e9 SHA-256: 291fbe93c8853a76f07111afcc90f3cdf0d98bad41ea8e3cbfa8d6dae6ac99c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://wastran.ru/uplcv?utm_term=quantitative+forecasting+methods+by+farnum+and+stanton+pdf PDF link annotation
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec523f45002---temizinovomeronavine.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/38438874632.pdfIn PDF document text
    • http://missinternationalbeauty.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/904925889.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/sagavetoxefujaxi.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606faf7f4b2d0---85933951024.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/kobumepiletu.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/87723221476.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/838468d00e457b7e8c4e89d2f2d037bd/37873599897.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/gn4d7aad2nk78md1gd921d0bp7/darexebupug.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/8b6oe2cgh2vn5cbl7lk1ag58o4/munopozeleverejetiwap.pdfIn PDF document text
    • http://fitviewer.biz/files/file/62788206549.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e7234454efc---42894588623.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/drpro758e6dr4kvcgmua8bts34/lilesozobu.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/63698273742.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/jilaxadokixuxaxijuxuto.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099e3d68b68b---33751161182.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/duxuvotanosawulogal.pdfIn PDF document text
    • https://europartner2.pl/uploads/12428718703.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/58845001479.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160befaa38bd8e---74185640962.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/76223637494.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/5a2db17b4bce323ba0323946ee71e3d8/82225875612.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160987093174f6---938958823.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/k29sb7q2ap7q7s9pe6pegr3303/8617828583.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/kisijebivefane.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_off0000fa95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA95 11500 bytes
SHA-256: f8662c78d13679fe5adb9463c71432a0d19563f779fac5916f49b9cacd42be96
font_01_sfnt_off00011556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11556 19324 bytes
SHA-256: b2181573f64a52474c1e77c3067edaf8da7daec56d0afd1e10f750d7a39445c5
font_02_sfnt_off000147f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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