Malicious PDF — malware analysis report

Static analysis result for SHA-256 b795c562b8e88963…

MALICIOUS

PDF

92.3 KB Created: 2021-07-09 07:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 362777843a553384ef5300d48cde26b1 SHA-1: 6dd272e7cac8a1fcb866f3dff75fbe8904effa3f SHA-256: b795c562b8e8896318ee56d8cb596aead34ba822ca41bad1f79527117c71fc5d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. Heuristics indicate this is a link farm designed to redirect users, consistent with phishing or malware distribution tactics. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://medvor.ru/uplcv?utm_term=gives+you+hell+song PDF link annotation
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d081187e01---xexiwakegule.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/69275805843.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/52t9nhqs0cr5b0rftqq6p1usso/53240876080.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/60693194673.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/rifitavik.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/58dcbe0fd7bbad7bd70ee1dfecc37b23/82686736271.pdfIn PDF document text
    • https://etadelloro.it/images/file/xepaxakugoti.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/d0ug6mdu2a06if7kmitps5e9ha/lowoneno.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baba78491d9---fekoxudomogilasesinunafum.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/e103ba47ea7c469e613e2d173a0c95c9/21113350568.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/mixapovuxutiwafufipanizan.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/60614a124ab4ff095ae120f5d2c2112b/fosuvukewomuji.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16099a27cdff8c---kilitiromamixa.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/werezetodujomejaxotu.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/li5c7ndq4qt5c3scgtvk1hff0p/jometazedekebamo.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210612_37AECEC8C5DA05E9.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/gaxoxoselemu.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/42979692444.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/9371b4e58d1aabd184d2b4cc548439e4/lugomapusarigixadam.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/bivi0huufiuh53valht4jn8pj5/zizemomuk.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/69519541999.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/7722d8b5cb104777472ccd481e5559c7/fusinizumalakugurol.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cd257eac0---81928331563.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96961719538.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/29789764693.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_off0001086b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086B 17032 bytes
SHA-256: bb6cb7d3fb34f7a6b13aff59794bf10e7e35078b284f3623cc8853386a4183da
font_01_sfnt_off000134cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CD 10348 bytes
SHA-256: 3a4459ed38e289baaf06a6dbea96dc2a0d871254cdcb93bc9ad364ede80c88f7
font_02_sfnt_off00014c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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