Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f28812d4e269777…

MALICIOUS

PDF

73.8 KB Created: 2021-09-05 22:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f9bcfe12f1031516939d0a7f52602ad5 SHA-1: 3d8050d7f726e1f715075439c538543616284a2f SHA-256: 9f28812d4e269777300418123f72c0627d97854d4c16a6d85242c94085c069cf
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded content are consistent with exploitation techniques aimed at redirecting users to malicious sites, potentially for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://sacc-la-chaux-de-fonds.ch/fichiers/file/fominugulasukun.pdf In PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/b90836bb4ad065d63d7c50e8e8611a64/mewomipugasonel.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/pegugetezezunozamupituk.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba16d3bf2e4---57634849828.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/81706072623.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/kininobenisi.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/b8a4f4b4feda96892d2a08edad8d27c9/8141184355.pdfIn PDF document text
    • http://rhondachem.com/d/files/wijigavovulenupuzapajo.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/76486676110.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/wekotebibuzijasupowu.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///70541857170.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/3f1b154bcb7156ef566889298f065bd1/zoromepuvolilugi.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610d807fab709---64676012793.pdfIn PDF document text
    • http://maihome.hu/admin1/file/vuroraxigutujurajut.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/74875553917.pdfIn PDF document text
    • http://agro-partner.com/Image/files/21285132802.pdfIn PDF document text
    • http://www.heksan.com.pl/file/27410684807.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec523f45002---temizinovomeronavine.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/34839820175.pdfIn PDF document text
    • http://dahchen.tw/userfiles/files/5253306847.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/dosobolovelebotofife.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c0635e3c1dee2527adde7347af086c42/lutoworupogarufazajujaf.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/11174915810.pdfIn PDF document text
    • http://twilaw.com/files/files/70998609908.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16091353390a52---2548056693.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/s40hukf9f3gvod16lknvivaigo/domoxoxikalogozobukef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=manual+for+craftsman+table+sawPDF 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_off0000bf7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD790 15820 bytes
SHA-256: 91644a890c4c35fe06b87adc598ecc817543d3a75d70f3611563d0573f5805d9
font_02_sfnt_off00010042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10042 10724 bytes
SHA-256: 36b507725487d868f15aaa632185c48386460a2776db2a0190601d07f6a20c75

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