Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50d403870077847…

MALICIOUS

PDF

84.6 KB Created: 2021-06-28 23:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 683068706169d59060b578b4483c3784 SHA-1: e85dc9fb8d70083cdaa653c4b149603dfcfc73c1 SHA-256: b50d403870077847d906a3ac94b1722d928dc8357a4847ea666ae00f8d1138f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecea803f89---17325500649.pdf In PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/9l75maf1ha8qdm2vr1ft2egg7q/deguwunemawetoxod.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea8682e45c---giwexad.pdfIn PDF document text
    • http://digifast.cz/userfiles/rusowilizugin.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/12mrtf3aopmpjborpe7gs8tjh4/xarenisegalefefifi.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160825061357b2---90467726422.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/e519b7541e59dfc1351df20805c84997/45081594537.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/96648005756.pdfIn PDF document text
    • https://akvaguru.hu/user/file/bumexa.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/vexenenejaferelefumoremoz.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/20633999f5e4df118b8e9fe60c22ce83/jeguxemiligafunaxelawator.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e54f4299e6---tiporizanodeparizekaf.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a073cc4d352---murivudokegelu.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/foraj.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/37682213224.pdfIn PDF document text
    • http://sb-78.ru/files/file/59792464006.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/97896021305.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/xudum.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/2f33abbaf51af74effa155ec24d43c75/51444150364.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/mominekewubawimenub.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/62992704106.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/22071059318.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/659d6bc4d54d6bc6b643b8de8a418a89/43642009763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=what+does+projecting+mean+in+psychologyPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE869 11200 bytes
SHA-256: 6200c73f979f29c9643d7fa046529639ba0ff481a2dd2ccd1f22310d0c5fcc4f
font_01_sfnt_off00010235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10235 16540 bytes
SHA-256: e138a7128d5425d8964db785d52012cd1babf0b6a2d61ad718a02bc6818a128b
font_02_sfnt_off00012d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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