Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3ee05dde1c4884…

MALICIOUS

PDF

86.5 KB Created: 2021-09-08 02:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aee609801000c120492dd9450833f369 SHA-1: 0c2dbbbcdbbbe1b71aa670501a6b25603837ff8e SHA-256: 8c3ee05dde1c488451e1728f305464d79ad408301b4eee01387d333aaf9838ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. These elements suggest the document is designed to trick users into downloading further malicious content, likely by masquerading as a legitimate file. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://irlanc.ru/uplcv?utm_term=download+resume+format+pdf PDF link annotation
    • https://umutisi.com/umut/upload/files/67580649511.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a84de4a82---pofenamubejot.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/55869792382.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fa18e0bb3---xamawiwij.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a11bd976520---82889252477.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/42890354841.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/latigorem.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/wanuxowudamaku.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/54623286273.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/701993098ab6bdda4b30732b6e4c2f53/badipevofigap.pdfIn PDF document text
    • https://hse.tw/upload/file/xejizu.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/d6f181784c1f07bda439e3a323efa508/kesuluwibe.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/jigovifi.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/xetaredofujijukizenidub.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/tosisirero.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/80476465473.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/191f3e5d2210a55cfb8d5ccadc5abf62/39409157196.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e11eeccba4---60020211519.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • http://hotspot-usa.com/js/upload/files/93917231557.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3a7ae6d6d---3300452338.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/971d30c87e85d8140da93cc0e814d65f/46697066143.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_off0000ef6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6E 10752 bytes
SHA-256: 27e2d1a98f3ba7f4a94c47bc0abf41601538a5b3b234ff87f03ab3ba31f15f5b
font_01_sfnt_off0001083c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083C 17068 bytes
SHA-256: 6a084ad07a14c60867ecf518e8ed5d40b7e2722a7b55d69d4f8035eb0fe9c9c4
font_02_sfnt_off0001341f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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