Malicious PDF — malware analysis report

Static analysis result for SHA-256 7235ff9ec61a4f47…

MALICIOUS

PDF

82.8 KB Created: 2021-09-02 17:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f07713e0c79061123bb7b3e6449a652e SHA-1: f1180cc77ee3741d197c098d151df0100953c5b7 SHA-256: 7235ff9ec61a4f47d682d3bb5b684730c06db71e81d0a5c1791009cdc9c5d1c6
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://debeleven.net/UserFiles/File/53890041980.pdf In PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9b8133dc5---moxilom.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/734160ed32d83041452cdcc7f700a3bc/digibufudedexezanenajoji.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/80486127379.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/sazetazekisajitaxojipimo.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707d6a49f08---xarinerofakagulawopogov.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/boxus.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/95268025961.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/518086d716ec68f175e490d950eb8c5b/mezuvamudubeloti.pdfIn PDF document text
    • http://tylerdaynursery.org/clients/8/8e/8ed7c4ff1d995b028c1180c1bccb3f4a/File/tevipinu.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/90203184975.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c93ec0e4e---zazaganepug.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/48ba19244fe1f79a732115efcfab750d/9776747303.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/mefasakanixepiwunimov.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbbb388c52---96784249828.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/46045707671.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/wonowejaromowupaxego.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/52806156103.pdfIn PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/84552883144.pdfIn PDF document text
    • http://vhshf.de/File/50797458551.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d2e1d15e1---videmukabe.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bobuxir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=comptia+security%2B+study+guide+pdf+2018PDF 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_off0000d874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD874 11560 bytes
SHA-256: d342bacc67453e4827a415b6cbcf45752836a323b52c0883b9a0d48945cb5699
font_01_sfnt_off0000f3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D8 19124 bytes
SHA-256: 49b9cc1c63e1efa3a00fcff435f75d4540a66f6b1eb9b5ef8ff6218cbe25c0aa
font_02_sfnt_off000125de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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