Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef1f80da69f71fd…

MALICIOUS

PDF

71.1 KB Created: 2021-09-09 15:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 11f8a6485235ff8eb8877cd08cb33c07 SHA-1: 0c023c7854ef2d675e0a6bd876fa9ea9bd16d2e5 SHA-256: fef1f80da69f71fd16479a874e7c8c0e192582d408813052ed44ccdc5832b47e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of PDF malware often involves embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=descriptive+qualitative+research+pdf PDF link annotation
    • https://limpiezasinasel.com/userfiles/files/zozazexazuresemetanurifi.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135759bbc8dd---kuvarugivak.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/jalividobukekifiv.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/70544316070.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/gavazaxivivaraneluloref.pdfIn PDF document text
    • https://finliz.lt/i/File/17745431749.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/zutujuxitegigoja.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/67ef30e19f7097d99a25ffd7e33ffc41/vekozitenegidalozaxutoz.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/30466860838.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161320a8aec6a4---63492489580.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/1825023324.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/34cd6ecb4a6f603a50901ce557e76022/62081968275.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/25615988235.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/59348844668.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/94849254438.pdfIn PDF document text
    • https://ikima.fr/uploads/file/wasixu.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/c26eaef366d86e9ba3e9a1af7efc9706/23699739545.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210901_B8130C1510A591CC.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/feruju.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/1ti8sbmfrc1l302ambs05vi78a/sawil.pdfIn PDF document text
    • http://wjcopy.com/upload/files/95378421589.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ssm1tug56kr6g5o3h1jqcu3p35/muzuxaga.pdfIn PDF document text
    • https://razredna-nastava.net/files/64951123901.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_off0000b878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB878 15112 bytes
SHA-256: 309f00ee034a189a520f58c48df749b6693d3572b558d41136425ca5f7c264e2
font_01_sfnt_off0000dd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A6 10808 bytes
SHA-256: 67e19c85757c4c0b2eb8a21ae97b463444553c36eec2e4cd2c344619a8456b1a

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