Malicious PDF — malware analysis report

Static analysis result for SHA-256 58dc664a703b03f3…

MALICIOUS

PDF

85.4 KB Created: 2021-09-18 11:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cd4a2af274f09a8938e02e4c6dcc3d38 SHA-1: be7069c7cf604a96578e8abffcfb70da33bdddf9 SHA-256: 58dc664a703b03f3c8c426fe2971ae1b5a3a486023aa4a71b4003bbfac05f507
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, several of which point to compromised WordPress upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://www.mnogotrop.com/ckfinder/userfiles/files/jimavevuruvu.pdf In PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/faxosoxegumiwuwakofugowi.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/fc436abq1jjok33rchsup67p5r/26106800230.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/66808087281.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/balugifuxafasudebujodew.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/defupajegoferim.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/xojawedoripomuwujokupaxes.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/5042055986.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/54096018367.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/76caf202bf9a3a2550fb705d2e5f8175/55748871737.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/20637012933.pdfIn PDF document text
    • http://www.bash.cl/media/file/957013139.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/nirinimowefivekirifogilej.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/85357846878.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/9o5mf39rcughfekv0vabicehj1/bijip.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d546bfef3c6ee3a37512ea0aa37a1aa5/segeboduregonisumotu.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/bd8f0d35a4204a5bdd7abb9369a3ecc9/bewodidototaxu.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/5c172e0f6cb4baf6cb6addc9cd58a5be/nizuw.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9f5b30d8f---mekikexup.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/tisuzerudar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=best+racing+game+app+for+androidPDF 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_off0000e972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE972 10968 bytes
SHA-256: 8f1ef1ceb5d4d3e1ea303db518ba6366273f67b687c4e1f65d469134d7a441db
font_01_sfnt_off000102b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACB 17632 bytes
SHA-256: d89ac0142e3a1ff0128587a70eb8fd815f7d7e162a7cd3644b55501410d4175c