Malicious PDF — malware analysis report

Static analysis result for SHA-256 b931e57495b61933…

MALICIOUS

PDF

68.4 KB Created: 2021-09-17 11:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 81a9b5df6c7c8bb0246895e114c7e394 SHA-1: 6ab61ea98a438832b7dcf8fe7bd77d4a4ad493ec SHA-256: b931e57495b6193322edd6534b364d7d815b34e036d5b1ebdad6133eece005fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users, potentially for phishing or malware downloads.

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://chcial.ru/uplcv?utm_term=android+mods+download PDF link annotation
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/1048cde0d2ee168014ca0026fdedd462/34894937726.pdfIn PDF document text
    • https://12shio1.com/contents/files/vewexosokuselegamexo.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/288e04929272cae3f87c89d6110621db/fugarikudinerikedijedij.pdfIn PDF document text
    • https://penzion-palice.cz/content/77995621428.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/oo2np3mkf51mstu7shmtr1ubsd/41182979280.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/14362682284.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/mudejulijomisad.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1630478868.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/15102406041.pdfIn PDF document text
    • http://chineseclothingonline.net/File/74850543156.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/86792738957.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/75673314397.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/55787263809.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/ribaveduvi.pdfIn PDF document text
    • https://castel.ro/userfiles/file/fopijakumevutipejikila.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/47332453994.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee746031c3---98403886420.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/87898886079.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/kevitijojajeb.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/36287379257.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/jowovelulagalivose.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161373a6903f9c---zawizun.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/82e3df08d758527975ca079755c792b8/35848465972.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/vs1l0em4mcr8in6tn0af0nhl2k/jurupomozosafodugiko.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_off0000b0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D3 10244 bytes
SHA-256: 01ee917565698a8e831d85d62ddfe0e427e91f7217d887d6cd33012d44536d75
font_02_sfnt_off0000dfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCD 14556 bytes
SHA-256: fa6bf7b5c968ed0817dca4e17446b7bfc44e8087442c8d0f64e48975b462205a

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