Malicious PDF — malware analysis report

Static analysis result for SHA-256 3578b486bc704eda…

MALICIOUS

PDF

74.2 KB Created: 2021-09-12 00:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5281a5dde1f03c2a91778da0bcbe0c48 SHA-1: e5457b27e6edbfe6752009aa124fd8afffde4f8a SHA-256: 3578b486bc704eda5cfa7a5787685188f1f36784744c8a70d81d34a91aabf1d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The file also functions as a link farm, directing users to multiple external URLs, some of which are hosted on potentially compromised WordPress sites. These elements strongly suggest an attempt to lure users into visiting malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • 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 http://verynailscm.com/user_img/file/wewematevutirimosud.pdf In PDF document text
    • https://atlantidegattico.it/file/98912797185.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/64184384810.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ddc7b29fc---kigunugofisup.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ait34apa0hrolfrh3rmqdskbo0/fafow.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/28663812022.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/6edj4tlt3mis2tq980r7ko3snh/31366473025.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/bawowejadoratomewaf.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/pivab.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/sutexoweripuz.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/14511140076.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109030956112245.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/51717342333.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/nojiwaguv.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/mekimuduxuwuperufoka.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/60249912368.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136e57fa11d8---suragetekowaxamatizuludaf.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1b5be48a1---jezekigubetetivasijedu.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/86790921862.pdfIn PDF document text
    • http://trivio.it/userfiles/files/gamovorarovijunuvon.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/wupexojinodaxelazew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=nova+launcher+pixel+themePDF 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_off0000be6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD680 17360 bytes
SHA-256: c6cf67f64eda838da419964dfc646f9cd484a53960ba556a7f009382abc9ba89
font_02_sfnt_off00010357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10357 10716 bytes
SHA-256: a1defe2ccb8ed6ad9a40402f057381791af877732426b608cece1c5abf417882

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