Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb1b633c5875588…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 18:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 83350e9a2863f7ccb9fffafe6acd6f47 SHA-1: 60b206dbc4d1fa96a01a007e42debbe6960c4469 SHA-256: 8eb1b633c5875588c5c770bbfed2ef4fcf731bf952466bf2702a24b68d69f85b
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://sysquare.com/UserFiles/files/51615049272.pdf In PDF document text
    • https://bem-sa.com/img/file/mozujaxofizatasevel.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/gewifobubesatipi.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/26667264833.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16145e5687879f---jiwitojegipiwajewibak.pdfIn PDF document text
    • https://nevisnews.com/userfiles/powuditolovoruvug.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/pinetenap.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/32209608551.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/baritilazaxezuguwave.pdfIn PDF document text
    • http://zenithmetals.com/files/xopugafewazexitomi.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/24877919162.pdfIn PDF document text
    • http://tulga.ru/editor/files/71524702584.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210905_123338.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1d19c2306---rabisawusefixubejojepip.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/xepemafusegazofiwomedu.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89887627182.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/32203164030.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/xetulopi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409534152e4---zonexapiten.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/431c8e54ba4478ac14556d06fee6d163/xanaruzavofulukuje.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/80498243034.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/34064347717.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/52078452958.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/42485267564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=tfs+android+18PDF 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_off0000b13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13E 15528 bytes
SHA-256: 32d0cf0df6e5b826f6b6d1b1077edb28884a0027fc2ebe8c582ef91a1ade4fe4
font_01_sfnt_off0000d84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84A 10292 bytes
SHA-256: 08ac7b420b06aaa0c1c6fccdba19490e55a88cec76af790f3213d8b6f3de51bc
font_02_sfnt_off0000ef8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1