Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e3567cdc1ad69d…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 21:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9cdf782abd7251dec7def4e9b4b37694 SHA-1: 733c5fbb1153d42999955247559df25d02e0d805 SHA-256: 88e3567cdc1ad69df0a6efcb2d679f8dd0e6e6ebb38c293da4a2b9e0eefa0310
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

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
  • 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://rwd.webseo.tw/upload/files/ligelufotopamibunoralip.pdf In PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/xutizisununavedij.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210904_4066D0D2AC46427E.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/65074605535.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/bamabani.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/8ae2c134274cbdd26382e3a8ea36fda3/fuvotumebodosuzolat.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/18112036488.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/siwodifupaxujabive.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/52369702392.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/latejefo.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/76554963974.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419e6bb7cee---potuparajagitexazurowawa.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/fdff07.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/70262492139.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7410e8352---perugamop.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/598995661.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/30107148872.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/84923981672.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/loxato.pdfIn PDF document text
    • https://vpmemorial.net/images/file/843064403.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369b5ac9a81---3214218766.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/zukomaperigozor.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/13183262527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=play+store+in+my+mobilePDF 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_off0000d7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 17712 bytes
SHA-256: f3e2e182ba9ebdb3b876adf4a41cccb1e02a58bc70d400d0c0e173f286a3ab91
font_02_sfnt_off00011dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFC 10524 bytes
SHA-256: c2fb8d8a814de80f4f3455b04e0fbcf81985af2593ccb9493ab33fe966a6b0e1

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