Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c285160171118ee…

MALICIOUS

PDF

76.4 KB Created: 2021-09-20 03:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bfa9266380b4562fe89fafb54202f899 SHA-1: 854b5e3f8c1c622183c242e9eabf6c2c827ac75a SHA-256: 0c285160171118eea152f5ff12d0769b9faee68a00688ad77a2c341e9367b1ca
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm, likely intended to direct users to malicious content or phishing sites. ClamAV detection and ML classification confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://philabc.ru/uplcv?utm_term=mobile+border+light+wallpaper PDF link annotation
    • http://headlinesdinerla.com/uploads/files/masefepikawesu.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/13814213117.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210912060620.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/jilovikodogu.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/62577681538.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/zukiwedefo.pdfIn PDF document text
    • http://cartopack.be/Images/file/bilamodez.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/30865773483.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/wukene.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346b5793aff---12823040366.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/fovonolelikukijavujigi.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/jatewemitenagelijubato.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/dilubunujepivanedima.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16133cf7893960---zosojomenubukilerap.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/888493c9de32c0eb82e3ebc5c539f6c0/96095968913.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/31594546121.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/23460688166.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/5c5c4603633434869597ecab072a20c9/29573426882.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/77683782951.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/gobijorujunor.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210919084900602.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/47895616031.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/92305448914.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_off0000c712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF24 17396 bytes
SHA-256: 3b6a56d687e8d81a768edb580386275539e85a8c8a165b7e0b27178dc4466feb
font_02_sfnt_off00010c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C53 10620 bytes
SHA-256: ff49ce9b9b8c5b4a8789928d6b10d7ee1d1f9d2a7bd70d109611fc896406f57b