Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79a7c973cdb17f5…

MALICIOUS

PDF

86.9 KB Created: 2021-09-01 06:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c5fec4aebc26daf6c168aafa16c35aa5 SHA-1: 715c3f767d47b9f6fd4c724795f14b99dd22d483 SHA-256: e79a7c973cdb17f5edb703d7029f89335f2e702d95e781288220cf9caeca5b9f
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into downloading further malicious content via the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://sincaremedicaltour.com/js/upload/vizabo.pdf In PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/91222670001.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa5c60272e---32607638413.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/d256125e8bc3dc8e6e467c853a124872/80691029337.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/91758157032.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1628518207.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc501d3e5a---61935920904.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088dcd9c254e---lupoxosazurosu.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/a1b850deed2a66fed08e9d031225eaa1/xebokukovujubezupozove.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/58254722550.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/e79c5873d1677ce3515cad7615ac17f9/20267619082.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/jokula.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/zizixosotuwepumitete.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/i0d1fho1s225rgm8clrpr3g17d/sejefikumikaw.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/votavujelemupeturejovi.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202108181252015095.pdfIn PDF document text
    • https://migger.dk/userimages/file/wexesawufiwajomafina.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/72280857137.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/7cc86eaf1473132615ff30cb704ad279/191630001.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/gunovatulezelekodeti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cut+up+peoplePDF 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_off0000f282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF282 9748 bytes
SHA-256: 8f391db6772179fa97d683cb45c7a06ecf1ac060f91ff820fc929e252d46af97
font_01_sfnt_off000107f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F1 18136 bytes
SHA-256: 1727793dbd9e109d9d6a6ad60501335afc05149b24d1ff6a673c230831177cd5
font_02_sfnt_off00013717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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