Malicious PDF — malware analysis report

Static analysis result for SHA-256 7484e29ba8b1c314…

MALICIOUS

PDF

84.0 KB Created: 2021-09-16 02:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a73e54bfd45442671d8df677b32f36a SHA-1: 7ab759dd07970676e4a39b10acc2d5760e84a3f9 SHA-256: 7484e29ba8b1c3145c5546d8032dfb02037034bd28dc409a76b5d126433fc970
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 multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure suggests the PDF itself is designed to lure users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/722296b5aed7d923a8ed1bbf6c7731d5/76148699013.pdf In PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/rudepitagolej.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/xemopexi.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/visoradojunitawisoz.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/xolujagapujulit.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/31404317211.pdfIn PDF document text
    • http://grupophi.es/uploads/files/gukivipidemilefovafoxuxe.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/51785328032.pdfIn PDF document text
    • http://aprt1day.ru/file/vakujapemutoxizetopajoro.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/73141755879.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/5638394408.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/34d5db7127bcebfb5b1963e3954eed74/22804068288.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/simabalogavajazojobeviro.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf09d223a1---87420212075.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/88172792278.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/kabejesitebilusubuvovix.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/mixuzubezujerodigal.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614112cca53cc---13156383902.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/84585240159.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/30103673881.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426d60247a6---90046025161.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/69071332249.pdfIn PDF document text
    • http://dafelia.com/files/mofixilupov.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/likewepagazixikuwineri.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/32106676391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+know+arm+version+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_off0000e14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14C 18292 bytes
SHA-256: d543977c46729d649500328a250a5deeea4d89be4f3f8baf3ea71de9ac208c00
font_01_sfnt_off000111a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B8 10600 bytes
SHA-256: 177399986b58987999ec00041de4fb005b25aed1b120bf676108fee84acbc3bf

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