Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9eb675278ef0b9…

MALICIOUS

PDF

75.2 KB Created: 2021-09-15 13:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 33f7fc2e9e960d5e60e0b0ac8e10bd2b SHA-1: 6fd9ee62939ee1084650488be818975d082210bd SHA-256: 3c9eb675278ef0b97edbaf5c32280034a59df9a93abd4b4dd3faa38d75dac599
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 http://gnatowski.pl/attachments/file/fubarabanifanesekemanini.pdf In PDF document text
    • http://unicaconsultoriarh.com/images/files/72620835884.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/85532262976.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/debamir.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/kavitov.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccad4d0a42---84885942893.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/88252064197.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/62544090028.pdfIn PDF document text
    • https://bunianco.com/other_files/File/ripokofivo.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/55719359280.pdfIn PDF document text
    • http://datcat.vn/2018/file/87288685913.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/11860916079.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/silomowiwavodesofow.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/96031008291.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/11791339292.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161315a8a36402---40128577710.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/midekolinexeduwiwegovoti.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354fc6a585f---12331390954.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/xezadezevozuditufelotamo.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/mumoneturukokezexen.pdfIn PDF document text
    • https://rajaunited.com/contents/files/dewoximadagajokiditilab.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210902084645_1281584502.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/zovitetaf.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/7635990695.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/92928415833.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/gorovezadesalolagezozutip.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/64918984255.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/5e970181c0859de0bf72316ac7c686dc/galawoxino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=elite+dangerous+combat+ship+tier+listPDF 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_off0000bf06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF06 11184 bytes
SHA-256: d75873bf439f0789e534fde0031ab86aebc16f8422a2b891834137de09b7fb9e
font_01_sfnt_off0000d880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD880 17264 bytes
SHA-256: aefdbdff1f51d883f9052742aae7a849d1439ffd7cf80d3605bad78ba1b935c6
font_02_sfnt_off0001053b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1