Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1ba86cf00a0ecd…

MALICIOUS

PDF

104.1 KB Created: 2021-09-23 21:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 41251fa6be6eaebbd3111ad4931bc074 SHA-1: 5bb932a7767c4716e4d9d26b8462fa8edbb97426 SHA-256: 4e1ba86cf00a0ecd4c292f06c9ff1a9f8fe4f065dca8742c4418721ef91d7af0
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous URLs, many of which point to compromised websites or disposable hosting. The heuristic firings indicate a link farm designed to redirect users to potentially malicious content, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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 http://nadafashionbelt.com/Uploads/file/4346078375.pdf In PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/noxurugopujujonolimijelew.pdfIn PDF document text
    • http://boxethai38.com/upload/file/47861830711.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/runozasipada.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/tulegivi.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/981a3fe3c3716cd05072115e7c24f0e0/74435707892.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/dereruxinosaboteb.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ce2e17abd---92789026470.pdfIn PDF document text
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/39529762474.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16147c06a45cf7---63288542558.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/ranefejajolemivasurenasat.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/rabom.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/nagagufivibog.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kelerisifirolefamu.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7ddeaedce---nozasoxogugoze.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/zawavaxiginajafelomefoz.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/runigepipo.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/69884751926.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/28922668731.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/lirulelorenofujaraz.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/lijazetelatuzewugibu.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16132cd21bf74a---poxaxiboxejoxi.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/29954747246.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/21553190599.pdfIn PDF document text
    • https://umartravel.com/files/74678796581.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210917_155221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pokemon+ash+grey+gba+rom+downloadPDF 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_off00012863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12863 21728 bytes
SHA-256: d519cb95ae01d5bb73df20a5ceb81d032269d514d978e5148c8915ed14a51ca6
font_01_sfnt_off000161b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161B7 10940 bytes
SHA-256: ee167585b09929c7a2c08fc683eb5cd9b3f623c439fa95a1e6593c2cafb67065
font_02_sfnt_off00017abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ABB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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