Malicious PDF — malware analysis report

Static analysis result for SHA-256 6277ddc9fa61e4f1…

MALICIOUS

PDF

88.2 KB Created: 2021-09-20 22:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6d410992ce70175ff1b6933a93788100 SHA-1: f152a88987975250b811359da3a038e383c8a6ff SHA-256: 6277ddc9fa61e4f1bb1f8ec4abc27e306cdb6acfcf46ab6a7ce0173623778705
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document is designed to trick users into installing malicious browser extensions or updates. Several URLs point to compromised WordPress sites and disposable hosting, likely serving as part of a link farm to distribute the malicious PDF or subsequent payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://dreptultau.hotnews.md/upload/userfiles/files/45444224907.pdf In PDF document text
    • https://tierlistei.ch/downloads/mevamoliwokezuj.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/mejimilokewibijasal.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/96538154362.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/fovexurawa.pdfIn PDF document text
    • http://cocoal.com/uploads/file/23547591396.pdfIn PDF document text
    • https://vgcanada.com/userfiles/file/1442549122.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60581309035.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/32819349630.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/3656edf2843b995e8e5a78154572e7f1/rurodibawadezebekulufudu.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/venukazavizagadukuvuka.pdfIn PDF document text
    • http://adfaveo.com/image/files/20210917_165658.pdfIn PDF document text
    • http://markone-tools.com/upload/files/xadobi.pdfIn PDF document text
    • https://ubranni.com/uploader/files/wifurutimipewakuwile.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/basikomumaxemuzuj.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/6943746914.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/74917105463.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/pemejavuzalif.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/tetuganavirazakegi.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f09de0e0fd---dufolakuve.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/zovogirorigulun.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/zofoweperix.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc828a5eb6---vegusudejona.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/jiginirebedofagasuropu.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210912_AA0D0D1496B17094.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/tojijovaxowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=lock+screen+to+do+list+androidPDF 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_off0000ed09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 20456 bytes
SHA-256: 9caecd2cbee95618f30bebe91dceccebcf93dcfaccd6d331866450ba5036852f
font_01_sfnt_off00012311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B28 10412 bytes
SHA-256: 69f6ca094ffb82bd1c52c5d491e21f046a037a1642112346d642969c9cb0668f

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