Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bfe71e8257821d0…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 17:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5c40687c13a4005aa6e4c037e079e1b0 SHA-1: 12fd1dfee3e58aa9416796c62de891abe281d912 SHA-256: 5bfe71e8257821d05722a8313fe7acda86be5486dd4bb0557c2568d6b23d3272
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 point to compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on low-reputation domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload via the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=professional+shop+manuals+-+troy-bilt PDF link annotation
    • http://bhk-aindling.com/userfiles/files/80818154845.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/fomoredur.pdfIn PDF document text
    • https://chsins.tw/uploads//files/202108090952121304.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/2268926403.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/71557339693.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/39420485205.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a88d452768e---58037201938.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f111b9dad3---jumekid.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/15107013080.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/nozukoxojalufapevoderomim.pdfIn PDF document text
    • https://alohasafaris.com/files/45230770104.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/sewux.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/86211484458.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/651cb85e1d1104254baf2d485bacdb96/91319055467.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/63782002373.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/vudiwasiguzevusakekoteto.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087fef4c960b---womuralenasobamabode.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/67336079565.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/15hrsvkqa127f5kap902apnuoh/zuluw.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/75928640662.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/58780611777.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/fvo14a55udfvasd416s4iqalbq/ximufikaxigakopiko.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/jobepobawulugoxix.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b770f6d057---tezunudanar.pdfIn PDF document text
    • http://hill-macktribe.com/clients/7/78/785e88641dcef8d5cadf71fa969cae92/File/zukot.pdfIn PDF document text
    • 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_off0000e111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF928 11012 bytes
SHA-256: 55798375d557de0fd0fa6b9910a76f361e821c23971fe7e9cedd5305a4335e33
font_02_sfnt_off00011264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11264 18336 bytes
SHA-256: a48a6ab9b1acfacf8402365d773d6d24e27f37f748511d986a50305e753a1c8d

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