Malicious PDF — malware analysis report

Static analysis result for SHA-256 741e4a0d994fb0db…

MALICIOUS

PDF

79.0 KB Created: 2021-09-30 19:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fdce8db3dcc7d0708dd785dc7d253193 SHA-1: c41adc072439a4ed9f0fc92283dff81c2ce807e0 SHA-256: 741e4a0d994fb0dbf6cbf0fdf683bf77331ce56b5618758e10b617b2ab300730
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating a phishing or malware distribution attempt. The presence of numerous unknown URLs suggests a broad campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://musicincw.com/fckeditor/userfiles/image/95452230368.pdf In PDF document text
    • https://travelsafeway.com/userfiles/file/78078898272.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/ditepevasadiwoxis.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/genonoguruvuv.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/bamufupafozezesifibilul.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109041724264454.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/17558365859.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613837f7dcc04---49802618852.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tuxadagok.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/kakejuke.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614878982cb2b---10224888678.pdfIn PDF document text
    • http://kvrhousing.com/uploads/85610556475.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/45568874314.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/18734649634.pdfIn PDF document text
    • https://camelcarpet.org/d/files/meverafobim.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/26123980006.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/wuxusepelojokefomi.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1614886d080407---labutabarome.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/9120089377.pdfIn PDF document text
    • http://orlickachata.cz/files/files/62311834218.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161494728d46d3---88490113191.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/54178242647.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/51127405370.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151d8f838565---44401816875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=moto+ringtone+flutePDF 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_off0000c64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE61 22188 bytes
SHA-256: 332db2aad104b77d8dfddc494ab3ba80b67df3f1befdd3e8678495a4b6344ca8
font_02_sfnt_off000117b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B6 10152 bytes
SHA-256: fe831ec3ce0cfcdb6e944d41018a95a28281ac891344d5c3710fac3b789bb714

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