Malicious PDF — malware analysis report

Static analysis result for SHA-256 8adf9007b65a1467…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 10:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4a968a0e9e9ff376b8bd5e493fc24431 SHA-1: 2e0ea18b7359ef4080be462561d2df4b22a3c517 SHA-256: 8adf9007b65a1467508bfd6d0f26389a8993dc14322a6e4bac9e594cf844530f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded 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, likely phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting the PDF is designed to host a large number of links for SEO poisoning or to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=night+funkin+mod+apk PDF link annotation
    • http://opgzvh.hr/upload/file/gukenexefaroxibojon.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/fiburepufadupufitugozime.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/mufojatof.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/82218298700.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/kuzuburezugalas.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b992baf4c---wusupodunizunanozoxida.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dca6484cc---84742741018.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/kinefegef.pdfIn PDF document text
    • http://holzbau-napetschnig.at/fogidaledulimer.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/bofejefefezojejefifa.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/vogurodiziritetes.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416c457af15---pekanolinani.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/46451292198.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210911131321.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/50315012995.pdfIn PDF document text
    • http://zatacorp.com/upload/files/zejag.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/bimipogo.pdfIn PDF document text
    • https://zzhqhi.com/d/files/34010034960.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16130a98dc6a54---larerunuva.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/demolatametidapuxased.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210917003734.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/12/file/20210912_235239_150.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109022316456378.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_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 10668 bytes
SHA-256: ec0bf7f697ba8e9f52cb676456027178db5e2aea779bd4159ed3a5ad6109975d
font_01_sfnt_off0000f367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF367 19240 bytes
SHA-256: e65b31e43a83fc14e55421dbac4d5b124b2c1258ac696741e624efe813044f80
font_02_sfnt_off0001241c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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