Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b750ffd00c8f663…

MALICIOUS

PDF

78.1 KB Created: 2021-10-13 03:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3e682ec0a07222eda2391a13d1315e08 SHA-1: 079b8fd99f500c5738d2181e9b4dc6642c68ceb8 SHA-256: 0b750ffd00c8f6637094075d556b6bddb86a0c09d84ad8d7a2c0b8b76ffa745a
172 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of multiple external URIs, including those hosted on compromised CMS uploads and disposable hosting, suggests a link farm designed to obscure the ultimate destination, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://organicfertilizerproduction.com/d/files/48644578549.pdf In PDF document text
    • http://cnex.cc/images/blog/file/65572252698.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/17610421490.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/43705089540.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bb55767fc---nufamuwenojuvojovad.pdfIn PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/werax.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/pulewutoduno.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7718061634.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/nonokaw.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b1ee008319466089c65fdcc5a2508ca0/gutira.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/8434ff621b1aedfa7f8bf5c9d4fad3a4/84594020576.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/61925905200.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/95546786661.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/71421224876.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/3907594248.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/givowotagosiparariwi.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/73104788465.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/xegawuf.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/28905404710.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/28811767910.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/rewizagu.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/tuvol.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xejizuv.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/migiximanadebubigewumono.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/5bhJmFgkeCE/uplcv?utm_term=how+to+convert+pdf+picture+to+textPDF 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_off0000cdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD3 17048 bytes
SHA-256: 231026b3ba0a14adb1502f680830ade55b22a52c632b87125327d0acb6921647
font_01_sfnt_off0000f9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F6 10580 bytes
SHA-256: 4a14526cc2f353d0af8cc4304bc5656969c9a5ede9fd964e24a39f12e69e9628
font_02_sfnt_off0001123d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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