Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5342ccdbf986c64…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 22:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 48bda42e0ea04f0a1a2cb5f8fe589a79 SHA-1: 8a7753f7c1d15c261ae3f64745f68287bb7f7be3 SHA-256: c5342ccdbf986c642c607f4939844e4540d1d6dbc8af198a8f44d0491035e18f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites, increasing the likelihood of phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • 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.
  • 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://adian.eus/files/galeria/files/56030104562.pdf In PDF document text
    • http://poultech.net/d/files/41351896332.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/19993776596.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/jajipofotuzijitenozaporo.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/diwusebunujuperumabukidod.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/nubobunubarix.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/pupepeguritufonira.pdfIn PDF document text
    • http://quetthe.com/upload/files/demerupakokegazexulafowi.pdfIn PDF document text
    • https://ratoempat.com/contents/files/nirewamujuz.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/xunakulovuguduwowi.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/vesogababu.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/281529b077ae2ba8ce0acfa48063d98d/78211712077.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/badosimugagetelukebekise.pdfIn PDF document text
    • http://hla.vn/upload/files/1240650670.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/b1308b604cca50e3899c616094e80621/71934663767.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/19089390425.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/fulutenovasaretuwilig.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/32718269697.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/gudurivibubupolotowixadis.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16142a4655fd3d---44888567605.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/87157962528.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/jiwizixe.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/85587330213.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/surewomu.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/zupevidegimeropalediwov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=live+cricket+tv+app+for+iphonePDF 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_off0000dd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD13 10480 bytes
SHA-256: d8c41f0da198b4f50754f3ef093d23090a9eb231eb82ff73ae09ca2668cdf539
font_01_sfnt_off0000f4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DB 17100 bytes
SHA-256: 1961cbbe8eab77115b92d9976a79ab4f95188d170a7f3a79a5f2b8457de041c4
font_02_sfnt_off00012114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1