Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8bee9d34a46273…

MALICIOUS

PDF

88.2 KB Created: 2021-09-17 19:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c9117f9c89b521b91308f3241adeebc4 SHA-1: 18a740701a8a48c05dee7004ad132e6c0597d004 SHA-256: 8e8bee9d34a4627375dd43c43645b8694b2bb9cd8903826b7406c751e37c77f2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://szyldkj.com/luodan/images/userfiles/file/gezog.pdf In PDF document text
    • https://resicolor.com/upload/files/fubojesimogenotowuzanibuf.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/moxafonemeraxi.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/92024805836.pdfIn PDF document text
    • http://parentini.it/userfiles/files/fegixefevowowefa.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/sulumu.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/sewukes.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/xavifepoladad.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614403c7d90e1---288404636.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/pozen.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bedcf66f33---80375010166.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/74701040492.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/lelafexinin.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/jisegun.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/xaleweropurawepuguv.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/vimetifibixut.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/vizuv.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/wanawofodufagi.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/kajatotinorido.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/gilagupadizedefevute.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/38930654611.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/vomopewigodebiwejanit.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/64535363030.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd2fd22567---14685977062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=where+watch+movies+online+freePDF 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_off0000f5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CD 17520 bytes
SHA-256: 552d0f2ccd5b41f03aebfe9bbcc92ede3ca4161256f4547a494d9cd1de2663eb
font_01_sfnt_off000122d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D2 10748 bytes
SHA-256: c6e19c9ff3c9458de63ec082f62208c7c421ca9c0253efa47f50ff55567d0ecd
font_02_sfnt_off00013b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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