Malicious PDF — malware analysis report

Static analysis result for SHA-256 95cde92eaff87b9b…

MALICIOUS

PDF

80.5 KB Created: 2021-09-21 16:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a32c3d04c1db0d2e8a951f20c6ab87df SHA-1: 6dff49a324f4ca1776da97de909a062f016eb235 SHA-256: 95cde92eaff87b9b2aaa24ff2b99d22095b744f68a1e2c277103802b8ad232a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, such as 'smidgel.ru' and 'etasystem.net'. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=vionema+apk+download PDF link annotation
    • http://etasystem.net/userfiles/files/pukok.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/n54ejabblsotk4gh50v69toqms/gumonifunetanexuse.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/4686623865.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/xepejuxibif.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebaa313f1e---13559914853.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/ca2213db449c21214b688f3da21650fc/tazosiv.pdfIn PDF document text
    • https://allianztc.ro/files/file/17457617864.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/29285321867.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/genogizuwu.pdfIn PDF document text
    • https://keongracun.org/contents/files/nifuloxenusujokixinotixip.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613090e358d62---40040952224.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/86808313333.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210903223027_v4nbut.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/zirimifumomoxulaka.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/mobutamimodetovamomixagag.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/fesozigefuparifosogev.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/98642324417.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/xadit.pdfIn PDF document text
    • https://aahs.givingplan.net/sites/default/files/editor/file/bekotopefirifafarivel.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/75560110170.pdfIn PDF document text
    • https://aneri12.eu/res/file/91971975580.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/abd8e29165661d41dd9e3e27fcc9231a/95880376938.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135959e2c127---ruwamumodaxasopaxefidu.pdfIn PDF document text
    • http://koutingchina.com/upload/files/10427544414.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/depinepezanavadurorijes.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_off0000d6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B8 17868 bytes
SHA-256: 4ac4d56f74a16a7de72de25ac92c12e45857fa2f547cd7018539c1b2d88e44d5
font_01_sfnt_off000104bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BC 10336 bytes
SHA-256: bbf1ff752a203e647c1d74775facafe4407da9abcf104e538fa0bde296ed5889
font_02_sfnt_off00011c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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