Malicious PDF — malware analysis report

Static analysis result for SHA-256 92dfb95c30ac65b3…

MALICIOUS

PDF

84.0 KB Created: 2021-09-20 09:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e07fdbdee16b08cd5c8bfeec5676a590 SHA-1: 94c4903790442e95a6ac7b71ba9d2f21d8720a21 SHA-256: 92dfb95c30ac65b3aa9956b20b8ab84cab6186922f4827d80806ac38ecce879d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress uploads or disposable hosting. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=file+transfer+app+from+android+to+ios PDF link annotation
    • https://bursakaynak.net/userfiles/file/gubitowexevupajagofisedo.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/wemuf.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/69066795178.pdfIn PDF document text
    • http://prograsifkalip.com/files/81020617902.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/94566133533.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/napumininif.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/kimudedefezawijomado.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/acf16d1228b04a2cb61bde15b76648a3/15137867411.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/gomixoxuzenuremot.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/navonupuleke.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/widukupawi.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/22024848061.pdfIn PDF document text
    • https://netpage.info/userfiles/file/zegaputapifuvofexuk.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/bajazajilajoraxesujilokal.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76041846355.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/84933496962.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/lorotun.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/25567975648.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614607452395d---41922411784.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/42890869160.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/67097047832.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146d062df2c0---83100447193.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/38187195248.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/fonovesejiletaroseruvav.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/30658745332.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_off0000e26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26D 10636 bytes
SHA-256: 3b7bfc914c72d1efa9ceeb0bff848b98c7400363c9f3b0d642629494d143cbc1
font_01_sfnt_off0000fab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C4 18344 bytes
SHA-256: 9d7a4a89b30cdcb67d3c9bee12f7537ee400d59b5631b4b2b9e9ca7348364d6c

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