Malicious PDF — malware analysis report

Static analysis result for SHA-256 187b3ef458ff6b7f…

MALICIOUS

PDF

84.2 KB Created: 2021-09-19 09:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5af84b369878ffd2920842bcca1076eb SHA-1: a77426afc26bf82f17eaf7d648f51a0064709c17 SHA-256: 187b3ef458ff6b7f86e6832b26073fe0952edf529f3ef261211d93eead768ad3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS upload storage or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM suggest a link farm designed to attract traffic, with one URI explicitly mentioning 'warhammer+40k+pdf' as a search term, indicating a lure for users seeking specific content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=warhammer+40k+pdf PDF link annotation
    • https://dienmayminhchau.vn/uploads/news_file/pawoti.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/99662524204.pdfIn PDF document text
    • http://moretonassets.net/userfiles/85268205402.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/zezezovaludogesixovo.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/86472851334.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/mefuzanokivu.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/80625441910.pdfIn PDF document text
    • http://wsm.hk/images/files/21005537391.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/nigagapewemo.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b5e3adab8---zipelagorobukomax.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/jevoxilevevujuje.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/b9555a518a223466d00c386f7e967490/wozabamamalaput.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/vokojuvu.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/161445bed24ff6---13264615140.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/507004716.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/jinukixugunobifamo.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/33379372871.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/wosozukodunina.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/5695169122.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/gigagovetubifalagosi.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/kenepilibutitidotepipa.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/1lp5d7jmrg1ubhel3u44n2tu3u/julukawutuzuv.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/17708829360.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/19638272302.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/46277469609.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b390716e547580fabd0f2f0f063186a/99914454991.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/92496502094.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_off0000e2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F2 18460 bytes
SHA-256: 9bec0fc5ef8c5cd08930d51deda61f259dd87345f72b13ad86227c357e183fb6
font_01_sfnt_off00011365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7C 10420 bytes
SHA-256: 9483129c0eeae4339d01fa6516e48f166952ccba79cc40f5a2b1eb80d38fb6b2

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