Malicious PDF — malware analysis report

Static analysis result for SHA-256 2357920515e638a4…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 06:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 15832dd30d96f821eb6349272f54988e SHA-1: 4242a86a15948fecb2e4aef879fada7922b913d7 SHA-256: 2357920515e638a4de1e667cf1fdf9b313f91114e5149d6681736f4cf326ea5c
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating embedded JavaScript and a link farm structure. The presence of 'Fake invoice / payment lure' and 'Visual download / call-to-action button lure' heuristics suggests a phishing or social engineering attempt. The embedded JavaScript likely facilitates the download and execution of a second-stage payload from one of the numerous URLs, many of which point to potentially compromised or disposable hosting, increasing the likelihood of a client execution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 9

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://langfordfinancialservices.com/userfiles/files/lezakamuwuzonimofewebo.pdf In PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/56039871370.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/eahjb2m346br6ik9a1q8ibvk92/69090862403.pdfIn PDF document text
    • http://www.moyekolodin.com/files/42189210626.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/lezujopa.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/nukegobomi.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/mikofadazisijetavizowori.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc8e9026b9---jibodebiguruf.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/kidogoka.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/91617c5177318b56eddc79db009cc244/jopexowokeg.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/zunogefenigeweti.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/bobapunetameni.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/kefinusuwoxurirexuzo.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/96412370394.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/50349100957.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/jepapaparamugibakosara.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/jufopevarugumuju.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/titevukuwefitijupiv.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2b6a8d917---juvixawimuguberami.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16138e0793de0e---jobekegogiforivibubuw.pdfIn PDF document text
    • http://kd-council.com/upfile/files/wulukikogaf.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/93658207458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=subby+subscription+managerPDF 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_off0000dbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF401 11100 bytes
SHA-256: c6b1fe627ae05e7f007701fd518c644cf712ef9607baa75f912cc00389c95498
font_02_sfnt_off00010db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB5 17508 bytes
SHA-256: 8ae1b74f35cb2a9bee473b77a1f576b6dc431f8502017a86c3f4d1b1eef16da5

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