Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f355edfde8a0adc…

MALICIOUS

PDF

87.8 KB Created: 2021-07-23 10:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0d13799cfc5d25f9579e285df0073130 SHA-1: afe0c48d9a9e35c980ea305f940988ec8d58b06a SHA-256: 3f355edfde8a0adc8104c9a6178223b4a6205a96f40901880672e92faf3264b8
156 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains numerous links pointing to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the overall structure indicate an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vandolderskb.com/images/usr/rusizagi.pdf In PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ffa951a64272785ee0b60a7fc5da1e0c/subanejosubir.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/mefefenotujifali.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/ziwirefomutud.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22e7d3985d---juribomomawaririlemu.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/f642e42d3faa4736a5448dd2cba5867d/76968213734.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/9cf5hk782svtk73ve6irkd71g7/sanatafafapezepedifuf.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/84808424454.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/69313651113.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-05-28/images/files/20275249510.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/mexasotubesele.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/77873953816.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/7kmhr1u1rf49o5l0kc8c91i7e2/winuguzopubesapufetegopot.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084707e803ee---zanisalakan.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/99536183910.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/papawaxa.pdfIn PDF document text
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/deboduvorom.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/lominoforujafazeborumavu.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/tapuzukakapuma.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609691909a271---38930651339.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb1e320e8f---wodoxuwuj.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/zejepipebavidi.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/91321139147.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/76cee134682082f96305b07ca7c63ccf/xifewulixebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=introduction+to+java+programming+solutionsPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/2628a8a23ce24d3d180f1f4d8403e644/diwikudujaxaxawofoba.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_off0000f24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24F 10972 bytes
SHA-256: 19907244924bca63ce1e98631ba3d9966206a470082b17ac6c3e73c48e572e35
font_01_sfnt_off00010b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B86 17272 bytes
SHA-256: f6038e6c38a450fe609bf561353656dd7d2c0934a4efc871be616757820762fc
font_02_sfnt_off000138e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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