Malicious PDF — malware analysis report

Static analysis result for SHA-256 96590e219df6593c…

MALICIOUS

PDF

72.6 KB Created: 2021-09-21 19:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0315bedd4bb187a76add8209dc88c64e SHA-1: 0bfa6cff33ca6419481670cd41a22dd2f5ced5b7 SHA-256: 96590e219df6593c86455ad820435483fce119701dd56bdf572e3d5be4627508
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of URLs, many hosted on compromised websites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=why+is+an+iphone+better+than+android PDF link annotation
    • https://apc-algercentre.dz/ckfinder/userfiles/files/41724716413.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161422843afd8a---lofetewudokisebovina.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4f91af498---funebizok.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16136afe52d434---54167360453.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/31343204885.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/wolepivupusaxorefup.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///11829170754.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/xozurati.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/75184052307.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/sijovomonunokoz.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/90985180746.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133e3fd7137c---lazevotidimebituvotefi.pdfIn PDF document text
    • http://airsoft1.ro/files/file/jesulu.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/43133346460.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/kagalekop.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/33516860008.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/narerusifanototexekor.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/pewatunogodewer.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140309063567---zapipenobezigoju.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/razopotopazorasododabegij.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/furiledinaxedadubu.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/lenudobetesexalim.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/xilosamatupex.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/jogekosasoveleva.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_off0000ba05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD217 16660 bytes
SHA-256: 171acd766f79ccc2f1d3a85048ce1b23460eccdaf8907266d35b691be7d988dc
font_02_sfnt_off0000fc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC41 10692 bytes
SHA-256: 290ce7c4f133a12305ea1848003389968dc89ab6588d90ed76d90dbb1e876810

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