Malicious PDF — malware analysis report

Static analysis result for SHA-256 399c15c73e043770…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 06:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2165f76f101fc7468944d6460f278ac9 SHA-1: a80c116196e02e53b869ccdd03bfb3f33d2af713 SHA-256: 399c15c73e0437705c3ff95ab078c87becda89e1c9f7c8b48428223993e91bca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous external URIs and embedded links that point to potentially compromised WordPress upload storage and other disposable hosting sites, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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 https://nomylo.ru/uplcv?utm_term=game+demon+slayer+android PDF link annotation
    • http://ankurgroups.com/userfiles/file/11762964218.pdfIn PDF document text
    • https://jobtiara.com/files/files/samudilavoredelak.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/junulatujoselemafafijev.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/sijokorofegijatitu.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1dbd3ea5c---93911401923.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/wokagogelodajudokiva.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f6cc4fdb3---66646492410.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/98329576892.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/sexudawofosadopaxuwibum.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/98894958040.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323bff1c41f---78946054362.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/9e762c9847d310349544711c02964d3e/jewejimowemekufubefo.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acf7a4cbcc---76803431821.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/93133862905.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210907200144331589g7kx7.pdfIn PDF document text
    • http://15881588.com/ckupload/files/28918209118.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/86404d915d131f07736d919bfaec460c/tefewuwelebubunopi.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/tekirujanemokufejelefekon.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/pugubas.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/85338552290.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614660de6a9d7---muduxagiporedebopem.pdfIn PDF document text
    • 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_off0000cd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56A 21604 bytes
SHA-256: fd6c1c351534f9eb2134de2e9df7966ad352e9b676ac237ca3e939f40293a118
font_02_sfnt_off00011c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0F 10464 bytes
SHA-256: 9af86de349f6d758a93f698ea4b0035f7518d74bfc70d569fe9ade0593c492f2

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