Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d87d12b31c8b5a1…

MALICIOUS

PDF

78.6 KB Created: 2021-09-22 18:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a57fce819b236cb70e0d1b222f1a4c9f SHA-1: 72e872e277f8c20f1be24ec09ff88f5ca4dca39b SHA-256: 2d87d12b31c8b5a12f70b7cb5a50464379e5ec386850bfdb3ab68e5fe5e4c0bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of link farms hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://laborke.ru/uplcv?utm_term=android+webview+scroll+to+element PDF link annotation
    • http://garankuccu.com/upload/fckimagesfile/c12a69be17cf8b9a1ade4d9425341724.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/99574949085.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/kinawib.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/vewivaxokezilela.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/19557326670.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161483bbd322e7---suposo.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/kiminemefupoxijawule.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-21/20210921114637534331.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/wiwonatasimak.pdfIn PDF document text
    • http://apart1day.ru/file/wuviravubuti.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/87405355354.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/rixuzed.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/97283301133.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/bukakopoma.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/45581785021.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210919051958.pdfIn PDF document text
    • http://centromp.it/userfiles/files/98882401584.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/31463149143.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/qh6ste9t55locjinbf2ufqs4kv/75239905116.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/62504552724.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/fuwebotejetovepub.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/rarimubipelaf.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/53521902151.pdfIn PDF document text
    • http://mq-water.net/upload/fubadopoxigoxag.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408f7a010ba---pavelu.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0e29bbb9a---pesufejelipujibumefekoj.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_off0000c6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FB 20052 bytes
SHA-256: 3234f061cc747d601fc29a9e9f0c18c7a9f8858da76f3eec57f1caae3bb14132
font_01_sfnt_off0000fa99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA99 10640 bytes
SHA-256: 57ab38c93bfc3f20fa0e2f27cc389d226b8183d3501a1c614d0eb0232d955498
font_02_sfnt_off00011300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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