Malicious PDF — malware analysis report

Static analysis result for SHA-256 2902c802a5d4a654…

MALICIOUS

PDF

72.3 KB Created: 2021-09-20 20:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d22511da0b1b088c033edc85cad2de2e SHA-1: 0ee95b8a840852f152f98b1aa22dc2f08f9d0da9 SHA-256: 2902c802a5d4a654bf5a4b493760524fb33d3c2d3142c927188447b277c409aa
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging further supports malicious intent. The document body is heavily obfuscated and unreadable, but the heuristics indicate a link farm designed to redirect users, likely to download malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://zeamailer.zeapost.com/FCKeditor/editor/filemanager/connectors/userfiles/file/woxafuter.pdf In PDF document text
    • https://everestart.com/images/stories/file/36069143451.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/2092014598.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/mulelunisilim.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/89414393946.pdfIn PDF document text
    • https://foulardfotografando.it/file/redojujobogu.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/gotozabelewazida.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161422828af414---vezotezurikunez.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/88f33475920d42457a5d0eec240a5c76/86172862055.pdfIn PDF document text
    • https://tmtteks.com/files/zavefalaxewofumajezefi.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/80353027033.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/51129668735.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a825408f0---bojijejilibeta.pdfIn PDF document text
    • http://cnispgroup.com/filespath/files/20210920100607.pdfIn PDF document text
    • http://ipllaser.in/uploads/34446994013.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/tapujaruwewotobefema.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/83049241839.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b44669585---10627572400.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/pojejovinanijedoxiz.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/nemeludubugopimexas.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/73890303617.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/pokufumi.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/87591324870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=antivirus+apk+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_off0000bbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC0 15580 bytes
SHA-256: 7d42e5de41967275dbc360f1d95b9c668127c8df07fe88d3b32b057f97ce0433
font_01_sfnt_off0000e37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB93 10576 bytes
SHA-256: e7c5591bf394eaac35ec4cbd9991517c55b5445111ca82a6b62e502e07a4b865

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