Malicious PDF — malware analysis report

Static analysis result for SHA-256 52131f00d6daa417…

MALICIOUS

PDF

78.1 KB Created: 2021-09-16 13:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 094380e370a04e841bb8aeb336406bbf SHA-1: 5a4cfff92520882066505c4c7e4946eb9d98dc12 SHA-256: 52131f00d6daa417cc74a316bca108fd2d57631ad991be7206c67c3450b6c2db
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The document also features a link farm pointing to compromised WordPress upload directories and other potentially disposable hosting, suggesting an attempt to host malicious files or phishing pages. The presence of embedded JavaScript and external links indicates a multi-stage attack, likely involving the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbc6261c65---tukolozepiwoninufedow.pdf In PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/64840006792.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/32369511256.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/sixanopataxifepolixe.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/6e76e92b93a4de55e166d324784ec9a1/boramalasipala.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e18041210b---48925909023.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/nilinepi.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/zisepawafexagokavulotub.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/rijefakawezituxizosiju.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/2633379958.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/ferisukijezubogilijuvu.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613828ffbf3a6---mumigudexexisurapirosus.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/salixojugifunogati.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f7d782b78---86978793747.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/lozedoxijogotenufo.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/90285583015.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-15/20210915205538634152.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16304976964742.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/zolifozel.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/93468265098.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/rikigabatixulu.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/b88enqds47kuk03h9toujjhv6g/pilupukunomiliduf.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/xijebuteluredixobifeb.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///xibafutujunibexowujirase.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/dudedirabulalokimunuge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=introduction+to+networks+v6+labs+%26+study+guide+answers+pdfPDF 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_off0000cab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB5 10968 bytes
SHA-256: 4539680081ca7ee4dc548fdb5171cce21c2f1819ec4b8ffa67ddc0b4fa89af69
font_01_sfnt_off0000e45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC70 17656 bytes
SHA-256: 7e8e99abab456f63b0672f2c0cf4fe00b3bcc6a6e5f6df7917a7f494d90ad81a

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