Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90d31c9b93c90d1…

MALICIOUS

PDF

79.7 KB Created: 2021-09-13 20:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cb6bfbe7d9eb67ac0eb949382ae76f5e SHA-1: 8c13b2c563ef834ea6048a41fa872b84c5232b9b SHA-256: d90d31c9b93c90d1fa48aab28fdca876c89e9d1fe32e9881dbc2dc9e78157dc7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also contains numerous external URIs, including one pointing to a raw IP address and others hosted on compromised WordPress sites, suggesting an attempt to redirect the user to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ta6739fa5g4g0lobl827bgfu2u/rirowedotizuxariludalexa.pdf In PDF document text
    • https://stratasphere.online/userfiles/file/guzawipusujexegif.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/mesivokigifek.pdfPDF link annotation
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/brndgmq1aiq1dgjjrfotdb304q/kipusegofaxufuge.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16132e42b27eeb---12900499350.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/15203261154.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/maneno.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161363c4be27ed---87459542211.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/rezawalituxigupava.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109131007352470.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/18445367462.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/87788262870.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/vorolulamolutedibodejisi.pdfIn PDF document text
    • http://travellerisland.com/files/82741128929.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/lalifexujo.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/winivoritolinu.pdfIn PDF document text
    • http://haihengpharm.com/upload/files/66969609510.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/72922893087.pdfIn PDF document text
    • http://www.moyekolodin.com/files/6168194765.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/75722106914.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/wowikowulemadesexi.pdfIn PDF document text
    • http://kammed.com/userfiles/file/dasujiniwigozif.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/fumaduvorozozetelimelel.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137812e4b883---67985053631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=android+backup+before+rootPDF 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_off0000d3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D6 10712 bytes
SHA-256: 0e9010ea4807ee3e78b2a70739cc6ffec525030b58ccfc3d757dff8713848309
font_01_sfnt_off0000ec5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001046f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046F 17496 bytes
SHA-256: 4e944e8cf79f3141057d2501066b1037b7ebd691ef007442a0f30fab752fe1c0

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