Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da5c746386cc3f4…

MALICIOUS

PDF

68.8 KB Created: 2021-09-25 00:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c75fdf5a364f1710c16c024ed1e7c5b9 SHA-1: cc738a18986076f437b7f55a7cc0399200d90f3b SHA-256: 8da5c746386cc3f4cb9eeec59976c2b4086b42da2489897349f322557079f4e7
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms the nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/sidobiradon.pdf In PDF document text
    • https://fjhi.org/userfiles/file/mipasavixiti.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143893e92830---14240834264.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/loxeva.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/41478558925.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e2bb5e44a8---81626709728.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/46347757151.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/nususavuzafa.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/35101705869.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/55358107140.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/nilitawimuteve.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/19214161268.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/16868965245.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/vulawapikedatizolubirikis.pdfIn PDF document text
    • https://people11people.com/uploads/File/10735997756.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/fejaxawerur.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/penuzerapizewizinusu.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/65055050874.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/duxopakaparojoripozizisot.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/8721009263.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/merujolenujo.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/21/zokavizaxafenolo.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/detapikivuvir.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161496b1ea4668---58305903675.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613028cee83a8---71568307198.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=apk+to+appxPDF link annotation
    • 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_off0000b124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB124 9776 bytes
SHA-256: 628d6c093853ae3d6060f5cd90ec93e9e33576ca9dc522b383f2916ca416a280
font_01_sfnt_off0000c6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000decc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECC 15368 bytes
SHA-256: b41df2829e3a5ef491b0e5370dae22a44863da6e15be6031fd2c5c9ffc0695c1

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