Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd923d958a467d2e…

MALICIOUS

PDF

74.2 KB Created: 2021-09-21 16:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ea5483fa40336b329d2c1b3c0aa2392a SHA-1: 81216221bf6c5fbfef3d62a98ea504b29ba98cce SHA-256: fd923d958a467d2e587d0b73cd9cbd49180d571194c365f14084e872f9d4f140
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to phishing or malware-hosting sites. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://borneneskontor-landsforening.dk/userfiles/file/kuberisuniteseniwukudeg.pdf In PDF document text
    • http://rc-modeller.se/images/file///wetozefemigafako.pdfIn PDF document text
    • http://esangsok.com/upfile/files/dowemigudevon.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/45053460401.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/1785450924.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wafotufewuvox.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/36226725992.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/rilrbvg7q9k9r1b2lf1u57t9h0/nodoneperofikoli.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/16661023555.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407e1a65cf1---xopurowejabuzapulebozu.pdfIn PDF document text
    • https://istanajp2.com/contents/files/tomaronigitebido.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/rikegowakofofajurej.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/namatafegi.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/eafqhd3mnoa3ef766e8rkgg9gg/44078301586.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/rolefojulizepijodegebupe.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/52145414848.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd30500400---85066872527.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/gaguwabilufonekomuxonize.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/muzipenovaburenofu.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613130f47e7f5---gulen.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/jegaxejul.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/22693649860.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141224237321---kopakufijatesolivuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=draw+stickman+epic+2+pro+apkPDF 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_off0000bec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC2 10788 bytes
SHA-256: 5a8ee1d625a5905508dd1e94afef2bd51630d063d832aeb9ad552e40f011fc93
font_01_sfnt_off0000d7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BF 16668 bytes
SHA-256: dd32ead51df5b732d518b8cb5baab0a8bd543f475ed3129a9be3484feb6b5f12
font_02_sfnt_off000102d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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