Malicious PDF — malware analysis report

Static analysis result for SHA-256 29d75cfca8238b3d…

MALICIOUS

PDF

145.5 KB Created: 2021-09-19 13:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 801c7b3d6c7346f0fafcd216de069f05 SHA-1: e1304acf1af2cb6c650fa8879bbd816b24b327f6 SHA-256: 29d75cfca8238b3d2f9132d14f7ce635d133bb1a9fc39746b8f226cee7fc603a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO poisoning attack. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://nsk-nalogov.net/upload/files/94056364074.pdf In PDF document text
    • http://vizugy.hu/uploads/files/lovawesili.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/3nuch246k366dpucijvr11q0ao/91239281016.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/44797842802.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/51036574229.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e7989c532---91530175595.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/rizexamawetosamudutoraf.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/dajul.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/xoroped.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/87945571317.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/nenuvawapumi.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/2572369526.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb29ec3820---76135909835.pdfIn PDF document text
    • http://tedesco.pl/userfiles/file/81705601490.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/zuberewutarejuvipa.pdfIn PDF document text
    • http://videlec.be/ressource/file/gasorom.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/85545170693.pdfIn PDF document text
    • http://dezis.ru/uploads/files/71555910108.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/mitinigulujozoxativimuluk.pdfIn PDF document text
    • https://cncunse.com/d/files/83985662953.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/metiju.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/3106fc608fe336eeabff488ab6c90d8c/zozefiloxorezeximogum.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1927bc870---70134193832.pdfIn PDF document text
    • http://pk.mo/userfiles/file/75328921007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=lego+batman+movie+game+mod+apkPDF 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_off0001d402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D402 10676 bytes
SHA-256: 32a2c735c913158a7b5eee41392f701c598d5acbff2fda798c78aea70e5aa9c2
font_01_sfnt_off0001ec0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC0D 19412 bytes
SHA-256: f76e07ea4b4cae528c17f0ebccff7db4bb397ab241390c0371695001009c13e1
font_02_sfnt_off00021f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21F07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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