Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0ac30aaba8f3dd…

MALICIOUS

PDF

85.9 KB Created: 2021-09-22 22:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 68ffae25a7084f401c7cf2e6c6b9686e SHA-1: f73c6f5e4e7844367b0b14f2e5f52f81b228b6fe SHA-256: 4f0ac30aaba8f3dd096297096fe956198c5ee5fafdba19d026a7efab61c17b52
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The 'Remote-support tool lure' heuristic strongly suggests the document's intent is to trick the user into installing or running remote access software. The numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicate a link farm designed to redirect users to malicious sites or download further payloads. No scripts were extracted from this sample, but the overall pattern suggests a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://stpeterscbs.ca/ckfinder/userfiles/files/nesetapisozubovivaribefit.pdf In PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec3363b06e---jaxidupibajuwerukot.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/91957339935.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/revupit.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/87890968082.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/14955993735.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/9ce515555d782b509bb49af5fe8c5a36/9584702882.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/71404043779.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3dd95183a---zunas.pdfIn PDF document text
    • https://tenderdiary.com/ckfinder/userfiles/files/masanozasofubuki.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/revakigotirideledu.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/sadagikunogudoju.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/binusiwigafajezifakileban.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387e9bc4fce---82621961877.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/nuwilufijik.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/2c832f81ce1facebae69a1e4a878fc5d/70360001956.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/tepofurevaxelakojuzi.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/35054347251.pdfIn PDF document text
    • http://bresky.cz/res/file/kiboju.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/kifezetomax.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/22457753555.pdfIn PDF document text
    • http://arucax.am/user_images/file/nusowizazobodaravazip.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/32136324023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=bollywood+movies+download+sites+listPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/81e7f202fc80e1480ce2760e31a4363c/ragami.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_off0000e97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97C 10628 bytes
SHA-256: 277ce4d3464e2d0e5ff990c4d5f5ca104bc187d2efcaf6414764d57379458fd7
font_01_sfnt_off000101d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D8 18192 bytes
SHA-256: c4cd1a4c19dc9b464dca3f345569b953fc8682fb1e12ed2cc89361f4c3a7ef1b
font_02_sfnt_off00013190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.