Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15e939ed2509911…

MALICIOUS

PDF

84.1 KB Created: 2021-09-10 14:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5985da791f18be877aaacd2b533bbb69 SHA-1: 8c106a3c7a185d439835125ec489856cf05c88da SHA-256: f15e939ed250991122a2186e8dd650d486bc9a3315dbb3033fcedd70d0d927df
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the extensive use of external links points to a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=android+emulator+hangs PDF link annotation
    • https://e-ssuances.com/ckfinder/userfiles/files/xekisofozefezate.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/38796852534.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161391e6b36e25---pafusufejexapedanedezogin.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-04-15-32-09-53.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/92070148683.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/1157177966.pdfIn PDF document text
    • https://termoformat.md/img/files/liwaredabarugivip.pdfIn PDF document text
    • http://hydrem.ru/images/file/wodidoko.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360295476d7---rowexosezapatogugizaxup.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210905_132933.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/16044163421.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/fakobalimanu.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133831ce772d---kewibegefifinupugasu.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161327d9296ba7---25242829648.pdfIn PDF document text
    • http://abnicum.ru/files/file/30380875873.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613246186066f---mekopafomuveg.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/fumumubesujoxapivefilur.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090714150873499.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/dofirosadaxafavam.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/64157194258.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/mitugodewizimixobavesa.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/22341931594.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/zifutagikizu.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/38358387609.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_off0000e3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C1 17896 bytes
SHA-256: 0ed639c07554ce6806c15b09f2709118886dd955afaca477d3838178fb5438d3
font_01_sfnt_off0001123c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123C 10776 bytes
SHA-256: 1f1177247e21750dbf44e6b0b559c1f1442c6aa133da28e99d7ed4233d7877e2
font_02_sfnt_off00012aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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