Malicious PDF — malware analysis report

Static analysis result for SHA-256 afcf3bb9ab0d59ba…

MALICIOUS

PDF

91.6 KB Created: 2021-09-15 14:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 906aded0527d3945fba9e3977801a738 SHA-1: de4466fb70655e9215e433d4877f8edaeb3d04f4 SHA-256: afcf3bb9ab0d59bae922d9f18747f8535a7f27673e16bc7819d2b36ebc8fb19f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://biocoop.legreniervert.fr/ckfinder/userfiles/files/davifupilelamipijogudig.pdf In PDF document text
    • http://arkystudio.eu/userfiles/files/fapazatojege.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/kezixu.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/pukazelobapazokuzazede.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/25303998199.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3ed77f5a5---negilob.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/regosi.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/51029765705.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/ralefifovowodinopegifoko.pdfIn PDF document text
    • https://finliz.lt/i/File/tizunura.pdfIn PDF document text
    • http://boki.hu/editor_up/11269724632.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/eeqdvhln9eqr5hf7fl1av9nig1/68723739348.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/dapidugagotevumer.pdfIn PDF document text
    • https://plasy.com/uploads/file/wufirelun.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/nudasumimuxutiziwewexenom.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac3a2b40d---juxoparukazapiwavabada.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/48846555129.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/50872444871.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210913103228_bXVrdWZ1anVudWJ1.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/vewomivisavuxa.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/dotezoniwibipozulurag.pdfIn PDF document text
    • http://thecuriosityshot.com/vosexidurim.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/rulozobifuj.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/pigetizasarovawixejip.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20219273744375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=homo+deus+ebook+downloadPDF 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_off000101fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FE 18060 bytes
SHA-256: 76136cb2fb9d9e4a3093a9ac5949ecc269ea1cb9f6f0a7c1e4251e8c9a9cf331
font_01_sfnt_off00013065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13065 10528 bytes
SHA-256: 9960c403efaffb5a5314ad7cbc502399fadfd16068c68bdabdb89ee22bd8c45f
font_02_sfnt_off00014865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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