Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e864f1e921e362c…

MALICIOUS

PDF

107.9 KB Created: 2021-09-07 00:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b6b2120d5f509f22e55e6f8abb380137 SHA-1: fece2088964968935182a2a9fdfcf89d64615bb6 SHA-256: 5e864f1e921e362ce72425fec230b0e700f616fa8daa5746484edb9f7d63b2e5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the exact payload or phishing lure could not be determined.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://jatransfer.com/userfiles/file/88199981093.pdf In PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/966cd0ad08e0ee9b588530f16dafd2ac/rodozotemigizajukosim.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/63749483517.pdfIn PDF document text
    • https://aedwea.com/upload/foto/fesarukozusiletiwup.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/292141si80p3ab4r5iugs18468/88205006260.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210702204304.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/27823253574.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/6867758440.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/majexi.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/gipefewag.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7ed7ac55c5d8056e027603430585f0c8/18753198632.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/43161912708.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cda334a028---65026272501.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/89504476529.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/farubol.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16095fd965b47f---40938455434.pdfIn PDF document text
    • http://asfalon.com/__files/file/79149503432.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608712692e990---24752357440.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/xewijamegoloponususijufum.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/6533ef76b7c2a87f90bec14e187c6dbb/siwuxanifuz.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609893b16f19e---dekimasuvoxar.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/buzebinoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=manual+book+jcb+3cxPDF 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_off00014136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14136 10364 bytes
SHA-256: 4f5b47cd746f319bce402765bc50af28764919e077d546067b0158d6507bfdf6
font_01_sfnt_off000158c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158C8 18872 bytes
SHA-256: 58ea61af7ae6342ec822dfc2b93afad0499e14a90f80e41f590379a2affacbc9
font_02_sfnt_off00018a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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