Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f9176dba6460584…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 20:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 732de43a5084c7a2e49591fc988f31bd SHA-1: cfa214382dc0de5d1b6bae3248790a6ba92a1e83 SHA-256: 6f9176dba6460584ffcc45bfcd553cfde8f75614c685f713e81bf46fa2543c30
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, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple PDF link farm indicators reinforces this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://rasciindia.com/firetech/ckupload/files/9925112429.pdf In PDF document text
    • http://massageindex.nl/images/uploads/webelamejozulizu.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/60828066686.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/nedefed.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16133c1d983ac1---66997300465.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/93078645398.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/61523496974.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/14732030620.pdfIn PDF document text
    • https://cinemaparadiso.site/uploads/files/99240246647.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/towifexabiladudixoz.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/jokojilagotumokofe.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/70080795880.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/89ce520378bec1b46e56666fa8c6a0e5/gokekewenotudamidor.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/719bnrqum8ta242b10enfkgqjd/zunatuzike.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/jakuvevodezenuwava.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/32748f66072f9acf552b1411606a31ec/dagasobit.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/nimusofefagezolil.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/9793158165.pdfIn PDF document text
    • http://stisk.com/file/suzoboxef.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210906024419.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/roviv.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/dovasekux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=house+planner+5d+mod+apkPDF 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_off0000adb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB3 17288 bytes
SHA-256: 0298aadc42caa8dff7d193e33bd44446138aa4380f43d1d5af1b977d87818da2
font_01_sfnt_off0000d973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD973 10680 bytes
SHA-256: 5481e7899947892acc49b4a0c549b12b812cf139aa4f2af109c0c11bf9700fd3
font_02_sfnt_off0000f1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1