Malicious PDF — malware analysis report

Static analysis result for SHA-256 62b09bd942d9dc4d…

MALICIOUS

PDF

69.5 KB Created: 2021-09-27 02:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 81ed161ab8192295f38f3ad565737e60 SHA-1: c78436663956bd3bba36bc70b1cc64a5a9c5ab7e SHA-256: 62b09bd942d9dc4d862a705d153e5d63b7f3c62a462d7bf65df4a72dfdb9da61
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The presence of external URI heuristics and link farm indicators suggests the primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://allytemp.ru/uplcv?utm_term=xlxs+convert+to+pdf PDF link annotation
    • http://thevisionkharj.com/userfiles/files/katatilapidifetakazivup.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/milelanixaketew.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/68073332031.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/sefide.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/poroxemuje.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/zuregenojaxofawujifo.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/padomisijomijujatasodasej.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/feugt4dl2esd393casl9qfjqc6/34791223296.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/5141917843.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/34148214002.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/79701134678.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/60292446877.pdfIn PDF document text
    • https://auto826.com/uploads/files/68490173785.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/77293164870.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/gifakiratuwogevozoke.pdfIn PDF document text
    • http://z500.si/files/51923904485.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161348ba53b0c3---9194646249.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161496ff29dc3c---12654193397.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/webolovenunixuwur.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/tewewizenenixexufevi.pdfIn PDF document text
    • https://bor-diing.com/upload/files/46325628710.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/40869185985.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_off0000af11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC723 16664 bytes
SHA-256: 10323a9f816d3dea9acd2ad347f36bc25a2c62c60d1015ca80c13eea31886155
font_02_sfnt_off0000f124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 10536 bytes
SHA-256: c03a5955d70bf2382572bc5b8ae74f75294041d3c107e771a1206997ddc7ce78