Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab45f4b7834c5884…

MALICIOUS

PDF

88.6 KB Created: 2021-09-19 05:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eb1c6df7f71966622741e2d5714e54b8 SHA-1: 600d39f563189b38aec63db64770d9742fb5e2c0 SHA-256: ab45f4b7834c5884a02d18982adf36383dc33056ed289c77716e8e70f8500138
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links and the nature of the URLs suggest an attempt to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://drafthe.ru/uplcv?utm_term=how+to+check+dns+server+android PDF link annotation
    • https://suacuachuyennghiep.com/uploads/files/34343015566.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/28177667307.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/92071354015.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/90346901776.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/juzalotapurazetezifuvej.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/kujixewevufubujapi.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161419cfe05215---xiwexogexo.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/fodawuzekuwasaf.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/37869359699.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/luvugagesawamipub.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/7987919670.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/vejolirenim.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/52751428129.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/h87heqpq99e2gsoo0pso05rubt/38558086752.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/xofosumesewetevesonomiwu.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ddc93f57ddf1dc182c9292b1aa14142/60809960788.pdfIn PDF document text
    • http://ossokahve.com/upload/file/semejolezuxirugofuki.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/18617877429.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/zuzepof.pdfIn PDF document text
    • http://epicridesnepal.com/files/donuxozo.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/melewufudirexat.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/41149499771.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/mitoj.pdfIn PDF document text
    • 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_off0000f55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55F 18124 bytes
SHA-256: 43efe4e80ba45215d5ebea63e75617cd497ec42b5948c2e7e5b9fd95336de617
font_01_sfnt_off00012436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12436 10656 bytes
SHA-256: a908a75042303618579925c3fd1f587f97c16e9f066d18f3325d7bb2c89ea36e
font_02_sfnt_off00013c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1