Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c23d49aeb02307…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 00:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cede6f7bd24e757735d394c68e7b393d SHA-1: a9a5d8c312db7efb1bc736c06a57885f6cd79fce SHA-256: 48c23d49aeb02307918a9bac3823c4fbec5b7215e53da5040e23b98fcac1fd33
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various external URLs, some of which host further malicious PDFs. The presence of a 'download button' lure suggests a phishing or social engineering attempt to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=isaidub+zack+snyder%27s+justice+league PDF link annotation
    • https://lideregitimpaketleri.com/calisma2/files/uploads/67358240290.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/bitij.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/88685088287.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161319ced4c75b---52308778928.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/lofapakakexarog.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/molepeg.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/22649516241.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/2446012613.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/zopemo.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/golisalogusijutukevek.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/gatudelesexabakibatuvewes.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/bowalas.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/85603449029.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c023248fe4---74151650968.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/ditoreg.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/171029ea85a707bb8cb3d2b65ea0dbd4/nepekaze.pdfIn PDF document text
    • http://yjccnc.com/upload/files/27547548853.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/14811546167.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418ee299fa7---nefefozukupi.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/66345071277.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/gefapedawote.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/bezibelirosebiwulewi.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/3752716354.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_off0000d8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D6 11044 bytes
SHA-256: d9c3d035a6604f099309ea70e1fe921f4100a4acdaace0f904556e497c779a58
font_01_sfnt_off0000f288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF288 17892 bytes
SHA-256: 179ac964928cfdd1ad6a132dbc269eb5fb1baf5900f2d89fc8c3caaf8ed04279
font_02_sfnt_off00012145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12145 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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