Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc90ef0fc53aa176…

MALICIOUS

PDF

94.2 KB Created: 2021-09-04 01:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 36234530daa81a34f812788ab64a09bf SHA-1: 5f1c13e42d6a35761d94fffe2b9503918d415e88 SHA-256: dc90ef0fc53aa176a6456ef1529a2dc85e6203e85d7fb30e51bbf6727976ed04
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to malicious content. The presence of multiple links on potentially compromised hosting suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://theipbuzz.com/images/file/juwit.pdf In PDF document text
    • http://clubcrudupsonoma.com/clients/1/14/14cf715f5cd05ddba197ceaa5938d7d5/File/58769804138.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa80d010b42---tetul.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/58544576563.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/et9n1mtrc77niajjk7286gnv7k/famokijusitub.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/ruzipix.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/55cb2dea230b44ad07279412fb0e8fea/xodidakitulimeludufojal.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/90533558231.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16108db9431bb0---boxilasivarifobizafi.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/68081126767.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/25494492998.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cf3250987---1921626138.pdfIn PDF document text
    • http://beiks.info/public/file/1654467666.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/45328768352.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/3c43513d650e72cd97ed521b84d55a06/57828220409.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115b01656576---27298904471.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609412f812c9a---xalofanegukasa.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/36445530024.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/mupubu.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/t82usrrd92f9jgr3usvtcn3h7a/bonok.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/51624933219.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/10716753807.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/retonivexikipatu.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/24162721568.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/davoxebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=homelite+bandit+33cc+chainsaw+manualPDF 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_off0001100e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100E 15980 bytes
SHA-256: bd10081a1906022a372c6746eb3b5a45c1e44384162702efa8c1e00bc8cfa1cd
font_01_sfnt_off00013977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13977 11024 bytes
SHA-256: fb1390329f57d96562910ef02e486c69c10c1b82a0106948159091ab2e10a434
font_02_sfnt_off000152ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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