Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c1e449b9d91c92…

MALICIOUS

PDF

69.1 KB Created: 2021-09-26 04:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: da568a7e4c0b949ea66a15b0ddf5d78d SHA-1: d76db315d64d17ea37e4b2b3cc05cc0f420b7b21 SHA-256: 70c1e449b9d91c92042ff2be22e7d8fdc7002893227df239e00662ebe81158f0
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is a phishing or malware delivery vehicle. The embedded JavaScript likely facilitates the redirection or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=free+code+v+bucks+fortnite PDF link annotation
    • https://awinresource.com/uploadfile/file/getefobukoraguwofubal.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/21037412365.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/ruxijido.pdfIn PDF document text
    • http://profiklub.sanswiss.cz/files/file/87714658773.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141621922557---8879355509.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/60540547687.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/jokufuxulobadosa.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/9d5a10240534c0b6a5721e7bb5db2ba0/94263425555.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/15523982084.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/pixafirewalesuxugodi.pdfIn PDF document text
    • http://z500.si/files/sakinixaturifapidunepe.pdfIn PDF document text
    • https://finliz.lt/i/File/11872418006.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/vapizisewuwanenoze.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/luzazuvim.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/xulepagofixiru.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/pujagimadivosodamogifebiv.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/40380842524.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/30829018488.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/7014539217.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/27340571306.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/54633300211.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/b30e2ef2804d9b7b24c569673ba76060/kidumovobazofeti.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613031766afd5---91752278700.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_off0000b222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA39 10636 bytes
SHA-256: d670b909538408f1ef68c05cd2615fe74c933c93aaff09a0a3ec19ed9572463f
font_02_sfnt_off0000e2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AF 14440 bytes
SHA-256: f36b7c4f851ad912d944e4dc9968fcb3c54479010acf62ff5a3f8e29c04d0c5e

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