Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb70149df97ca58a…

MALICIOUS

PDF

84.2 KB Created: 2021-07-29 23:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e0f2dd257fbacf8579be7539cf8d492e SHA-1: 6959c748119a69f677c437f8f299118f03b4965c SHA-256: bb70149df97ca58a0fccee5d051af1064186460515c82cff699e33d33ca4e921
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f79d03eefad---gepevep.pdf In PDF document text
    • https://juvelyrikoscentras.lt/Files/file/daruvezatelem.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/56072746240.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bad71418b4---68439285289.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801ada91baa---13336516486.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/tibesikabo.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/retomokipe.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/ac2e48e69b388c9ec914919ef51cd4a9/60162417539.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074686683d30---mujade.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/61351195769.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/47199951886.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cf53aac5422---33828671280.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/85067622452.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b57364abc0a---18804649337.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/zuduse.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/10658345231.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd94f93956---31601409736.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/8r05hr7b1rgsh1ukvfsiik93od/jokidegilum.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/33442794240.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/mutowolu.pdfIn PDF document text
    • https://immobiliaresancarlotrieste.it/file/19423350332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=isee+practice+test+online+freePDF 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_off0000e761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE761 17004 bytes
SHA-256: fa5a907ead92a572c4da0541b13e8c26084a3f01541a35556dada905e7a689c8
font_01_sfnt_off000113c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C2 10424 bytes
SHA-256: cdb2d674e164d7bc197d22d9ccc9c6286730c0fdc981ca06e23489e5e306ffbd
font_02_sfnt_off00012b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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