Malicious PDF — malware analysis report

Static analysis result for SHA-256 239071266b8c4b8f…

MALICIOUS

PDF

70.2 KB Created: 2021-09-13 17:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8c536e2c56878ca833db91eb1981b8f1 SHA-1: 667055a0171789e5b4a50cd080fd206668e0851b SHA-256: 239071266b8c4b8f01bb076f1be247c1066a48dc2694cbbd3b7d8c299c494acc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also features a link farm pointing to various domains, some of which are associated with compromised CMS uploads, suggesting an attempt to obscure the final destination. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mobitransjogja.com/files/noxuzobofitipupova.pdf In PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/letavareluwedoxojaxe.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e893327eb4---mapexojilonidozalukez.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/wogoga.pdfIn PDF document text
    • https://forumsevens.com/images/file/dezojenudowulonupik.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/34604649623.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8bfd9ba7c---20633629169.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/bufokojujizagaxonaxa.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210913034620_gmshh0.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0846e6713---94816213565.pdfIn PDF document text
    • http://1careglobal.com/upload/files/23645419376.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/bopojotimenup.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/43450163342.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/rilabamiladusuxejo.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/lobukig.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/5168810348.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/lulekunijojesufufirumapob.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613a10cdb2b05---96308330839.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384667719a4---begokawiginame.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/63905864982.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/49040843991.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/42904350780.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/93943885431.pdfIn PDF document text
    • http://honghuibio.com/d/files/44088455428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=real+steel+game+free+download+for+androidPDF 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_off0000b408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB408 10828 bytes
SHA-256: adf179908709e16363d0796da19c9e0be42123dba01d6fe669ada2e210f3a067
font_01_sfnt_off0000ccd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EB 15116 bytes
SHA-256: 40e4e91d4c8fa28b6149981edef478589aee07303dd2a435f29ac94ecd55fe26

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