Malicious PDF — malware analysis report

Static analysis result for SHA-256 304cfe0113cbea46…

MALICIOUS

PDF

83.1 KB Created: 2021-09-09 06:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 755489ae6f13eabc059186a561650d78 SHA-1: b1e12e0fb889738f0a6511bc464819c90fb9033c SHA-256: 304cfe0113cbea46eb5de915e31b633b015af3c513a7780441536d28a29018ec
196 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, presenting a fake CAPTCHA to deceive users into clicking malicious links. The document contains numerous links, many hosted on disposable domains or compromised CMS upload directories, suggesting an attempt to distribute further malware or conduct phishing. While no scripts were directly extracted, the overall structure and heuristic firings strongly indicate a malicious intent to exploit user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://sbairs.com/datas/files/9169552010.pdf In PDF document text
    • https://miraclechuppahs.com/userfiles/file/48659281786.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/68681045592.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/dafunojezizulejiso.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/69081502550.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbc6261c65---tukolozepiwoninufedow.pdfIn PDF document text
    • https://superpart.com/files/polupilagosulafuxerifuwet.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/bumenivapano.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/busorakivurinexobin.pdfIn PDF document text
    • http://caramelitos.sk/files/67283440069.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/jetaneujavk8dblvck62umrtp1/95289335958.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/11515496534.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394e827a4dd---veduzuzapewupafik.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/31385235737.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161312f5d61e98---tesozobakixelu.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/99565587185.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/zuvonaremebitesiwix.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/suzakidedikufuxuvuvebu.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133cf5f54f7d---51054125539.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/woxebazuwulitozinabeji.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/5b7722678c7274c244613c0f61457ea2/gikevatapis.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/67171819630.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358e835f925---23293373633.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/suvonetesojukuwuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=fortnite+3gb+ram+downloadPDF 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_off0000df30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF742 17920 bytes
SHA-256: 438581c509a5c4d8b7dbfde4872a5e867a5f73144314b3fc290eef97cd626a77
font_02_sfnt_off000125af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AF 10796 bytes
SHA-256: c13923dcbad3692936001f57f408de0650b346d6bad35ac9065a10d942c7adba

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