Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7aefce83edd711d…

MALICIOUS

PDF

77.8 KB Created: 2021-09-11 17:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1d5c2a9f094204532a78a5320faeebfc SHA-1: bcc698e4876410e6ee87714dd79915a7115ab67b SHA-256: f7aefce83edd711d53d1e6bceeb8572074b428622b8991597c20306f195e8814
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting sites. The embedded URLs, while numerous, are primarily used to obscure the malicious intent of leading users to download further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://chochosanencino.com/uploads/files/wapirazegekoxozaginotu.pdf In PDF document text
    • http://stin-verdon.fr/assets/Image/files/tuxidapopirabifulu.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/lilozisatij.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/mowofikujadobiwiwu.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/zexuwozu.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/cf92ed4df037e132782ba62c1f16c067/77521651721.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/noluxuzuzisote.pdfIn PDF document text
    • http://idroter.org/userfiles/files/64883289345.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161325ece091e4---tifatejiwujifuxozesa.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/8295907435.pdfIn PDF document text
    • http://aimic.com/userfiles/file/18627621643.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/piripututoselavoju.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/wugutekeginubizofafoguv.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/vujuvavovebuvoxazonosub.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/dojaxuju.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130938288386---63968567889.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210904_012356.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109080651437436.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210906162033_2062480591.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/92514230045.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/degekigofuzuxodumis.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/3224925583.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/vafakepuwarawafol.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021911919536726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=alien+covenant+tamil+dubbed+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_off0000c104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD916 22292 bytes
SHA-256: 40687aad811b032e9c718e5b0b494aa0f1a86124fe55eea590df3ada7b04aa64
font_02_sfnt_off00011145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11145 10636 bytes
SHA-256: 1b855152c847427d0358b6770c19c0a5633a3bfae0385a66090249784187c3e9