Malicious PDF — malware analysis report

Static analysis result for SHA-256 01cc070afd67112b…

MALICIOUS

PDF

143.5 KB Created: 2021-10-16 16:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1f5718ed918b9b8114934acae7c57b2f SHA-1: 06834e514d89fb2dbaea4174c17d08f084944c06 SHA-256: 01cc070afd67112b5d2b6d691528071d5ddcb4b263d48baa2063ae2fa8a5cbee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://toanthinh.vn/webroot/img/files/wokujutibid.pdf In PDF document text
    • http://ipublicity.cz/data/file/gusegifolexelab.pdfIn PDF document text
    • http://kyokushin96.ru/admin/ckfinder/userfiles/files/nixeb.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/70183348499.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/dotufirevapixirixazimob.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/futexo.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155f8d2ea5d5---wixagopu.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/xuxobozikiranimetikoke.pdfIn PDF document text
    • https://windscrm.net/files/file/xukofifod.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/5g9bape1c053a0j3m3m855jh5o/59118215563.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/mavisagabokazej.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/01fbb4bebe27be5fc15f68eb0e9dee50/14030749362.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/55243738968.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/gidowuwo.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/buzaxat.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/37204191514.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/50093851097.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/fazaxobemagadakubada.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/sanasun.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/wapawekejuxawikawepuvapi.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/35607981888.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98497610357.pdfIn PDF document text
    • http://zenithmetals.com/files/18726702830.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/35531806203.pdfIn PDF document text
    • http://steinemann-ag.ru/62090380628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/1hHberoKktI/uplcv?utm_term=frasier+coots+and+laddersPDF 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_off0001d0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001e8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E8FA 10340 bytes
SHA-256: c41a0ea521e725405659e408e0c5b934b8138c998bb14bb1b2bee3233bd7ca0c
font_02_sfnt_off00020064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20064 18864 bytes
SHA-256: a71a50e7323cdf5c1a59859e5a1d22ec1253988619d63e199c1a94b3258f764a

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