Malicious PDF — malware analysis report

Static analysis result for SHA-256 5334fa8690fc28a0…

MALICIOUS

PDF

74.7 KB Created: 2021-09-04 06:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9a92693c1f07992eb4f2b9070a898416 SHA-1: d1dfbd291defeef7a3643387508659412e259684 SHA-256: 5334fa8690fc28a09e68def7f221accb5a8df840397e69eb18e27691afb048f8
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites, many of which are hosted on disposable domains or use link farms. The PDF structure and heuristic firings indicate it's designed to redirect users to these malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b30dcf5c3f4---97876610534.pdf In PDF document text
    • https://kuepancong.com/contents//files/78848952096.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/juzifejadisobe.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/54116994634.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/29994811173.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/71569373929.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926120d439d---78164665900.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/wiwowemuvus.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/56986174764.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/673664ade45874b99428f8b1d3b9283e/xonufedijusuxabokapu.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/53202601619.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/pasigifonajiraxedatozebo.pdfIn PDF document text
    • http://land89.com/ckupload/files/gozumoxiwebowipagopoxom.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/gelidunabisikosijo.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/97408477926.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/nekaxopisibosedij.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/i846amf5ccrmsneq0kgsd8qiqv/28367804042.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///15456127515.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/sudukonudirelilixawufuvu.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3b0d713ae---76262664786.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/e32e9a98f8d663c9998147c57eb55ddf/devosekebi.pdfIn PDF document text
    • http://70sromans.com/clients/871711/File/36263482067.pdfIn PDF document text
    • http://normel.org/files/upload/file/gekujonidudabepuz.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/vatukotuzobolegavawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+barber+of+seville+piano+sheet+music+pdfPDF link annotation
    • http://irodori.kir.jp/files/file/54572255828.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_off0000bf0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71E 17344 bytes
SHA-256: 0a18009cceff5be6a82e45ba17bdefa4d59910bcb6020a2ff6518a6227027e10
font_02_sfnt_off0001032f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032F 11152 bytes
SHA-256: 976691d4b13fd11ed2e1b2625f5a6bf32103a8f92e709136812b91970e8501e5

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