Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd66b5214252fd89…

MALICIOUS

PDF

81.0 KB Created: 2021-10-09 19:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5411e91970057d49fb092c5f7edbb106 SHA-1: 7353e4b5291f391be66ccb90187b8b898e03d8bd SHA-256: cd66b5214252fd8998e4286106f0b9f4ccea817fbe0d60876fc200721b17c8b7
196 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a browser extension installation lure. The document body is heavily obfuscated, but the presence of numerous URLs, some pointing to potentially compromised or disposable hosting, suggests an attempt to redirect the user to malicious sites. No scripts were extracted from this sample, but the overall pattern indicates a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://bebsulmare.com/userfiles/files/82692468996.pdf In PDF document text
    • https://tch.lu/files/files/tovapaputedadiferezon.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/bajuwos.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/vetelusupuseturipeduzuzu.pdfIn PDF document text
    • http://denizyemek.com/images/fck_upload/file/xurinon.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/gowik.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/dadazuzepafawikanug.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/zuziwiramum.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/vufavaruwalakuxavi.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a9bfd920b---fijuposudaki.pdfIn PDF document text
    • http://tecksco.com/upload/files/pobutevumikado.pdfIn PDF document text
    • http://sooclose.eu/upload/File/71206548319.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/levokevesupo.pdfIn PDF document text
    • http://vhktn.at/images/content/files/tefedekafipenematowofoda.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdd28ac4ee---nibaxegajituviw.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/pupasemaguz.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/b25c531772ba232d71bb4a31cec6d252/zidoputogogip.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/gepiguzavovanatumiz.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210904140120.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/6137d09ce5553.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/xoviporunuwuzirilijefolew.pdfIn PDF document text
    • https://aayams.com/userfiles/file/vanabiguv.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/febirokenabos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=comma+after+fronted+adverbialPDF 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_off0000da04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 17192 bytes
SHA-256: 54474ebb30c94dc06b97c75e2e69ab4ad283a3e3894b036e02bc161eca57c0f6
font_02_sfnt_off00011e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E98 10584 bytes
SHA-256: c3904b29126f546267c342ca20b87c31cb6220ac0942f59dbfe93f87793c9657

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