Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffe1a988f6ceebdc…

MALICIOUS

PDF

108.2 KB Created: 2021-09-08 11:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 915f3da47ee059f32311a5fa47f1bb83 SHA-1: 31e2285a8f91268493a57b25b16641b7a334641b SHA-256: ffe1a988f6ceebdcb3df2d053e8c0ccabd43ce676f20c66cf0bdb10244958b9a
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to domains that appear to be hosting PDF files, suggesting a link farm or redirection mechanism. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs indicate an attempt to obscure the final destination, which could be a phishing page or a malware download server.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://peaceinsrilanka.lk/userfiles/file/15617372994.pdf In PDF document text
    • http://grupopiscis.com/upload/files/mobifepaxemibizit.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/bisidodimisopijom.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/23e921b0ef900e142e4029e818a0987a/75008564209.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/21378656184.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/71202648862.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609158315906a---92522549966.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ede0531d31f---gakutevedufubimakijemax.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/xewaji.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/vovilenuforagamokob.pdfIn PDF document text
    • http://kite-surf.sk/files/gijovujerenojevejetuje.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/ce26ab6726e8077cc92e23f7d7d9f455/pubaravurujefawewa.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/98547839788.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/ad96379f48b78b6a24504017fa0d4541/83054095322.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/de11ngua6ho7grdc9v8vi5tn0o/ferufapexezekadozowevo.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/13662489513.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a081192a90a---dafaw.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021043001323835.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/84e50f9600a1fe648a768973cccaf0a6/kaxutu.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/fovuxodikumobikudurasok.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ad4097950---21732962330.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ad9917cec---kekafofubawepo.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9333aaa12f---20159380730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=fet+biasing+techniques+pdfPDF 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_off00014085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15897 19724 bytes
SHA-256: 1bb49cd4a84e0b8244e047aff000d308b252fd3dec6bc4c6ffc2ca1afa2ae4cf
font_02_sfnt_off00018bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BB3 10996 bytes
SHA-256: 97ea6090bdef34f3767d3848c1d416bbbb270d05ac2f1d70c60e4bb7481727f9

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