Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70e5104e36dded5…

MALICIOUS

PDF

69.2 KB Created: 2021-09-14 18:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4ab123ade12f54bf68bf772ea82e3095 SHA-1: 9670a2d825ecf9811eb6dc8d2efac4110e7053c0 SHA-256: c70e5104e36dded5336a2a1c65e9317d0e6c757fedb291924de7b6ac3972d4bc
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, with one URL specifically pointing to a compromised WordPress upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

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://philabc.ru/uplcv?utm_term=name+the+regions+of+the+electromagnetic+spectrum PDF link annotation
    • http://unibox.lv/files/text/pilaru.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/60829796166.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/juravimuwapotufudikeka.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wefejolige.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/dowazejiluganaxeralufusog.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/fogom.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/17858540545.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/79530233352.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/muxejujunenebenogod.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/93861808478.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/serijeximosizate.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/24197234836.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/vowute.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd365dd66f---jutilisa.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/56874278488.pdfIn PDF document text
    • http://elpijisystem.com/file/bakuwuxotirerawibi.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/85750681473.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/52761993956.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/56800057039.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130ac17d52a5---76951927717.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1add9f9f0---povitapexikux.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/63383535128.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_off0000b0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A3 14784 bytes
SHA-256: 6a5826072e8632886a5a74b36e76a514136512305d2d43af6216b632922da0c5
font_01_sfnt_off0000d5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 11004 bytes
SHA-256: 0fad520530d1d80ea0c4f82c1dc704b0c543fcb3c18ccaf724a8dbf51f16e8ab