Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23fe4eafc71db0e…

MALICIOUS

PDF

75.0 KB Created: 2021-09-05 10:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5dee76077a83159cd547d8ad396751b0 SHA-1: cce7e30a7c55c62237509002403ca66d01348018 SHA-256: f23fe4eafc71db0e18d8ca8d92ced2e74834e196fb7dfa80953dc55d210ec7b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. Although no scripts were explicitly extracted, the nature of the URLs and the ML classification indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://queure.ru/uplcv?utm_term=chemical+burns+first+aid+pdf PDF link annotation
    • http://alimentosldm.com/userfiles/file/xanobamewokokovemojaxuj.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/21833993553.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/vapojejoxokepaba.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/r9kfvhir4l8mbhioiigb96uuqk/98504268585.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/dasuzeveris.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/jejukaruxezaxet.pdfIn PDF document text
    • http://jljemc.com/upload/files/suwurogefiwolepupopu.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/nofizapibotuxo.pdfIn PDF document text
    • http://fatename.com/uploads/files/202108220709178182.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a1967c9b7---jumologusagozovob.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/30e4528ba15fbef30672996d2da5524d/37020966834.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78efd9c18---15726346753.pdfIn PDF document text
    • http://partnercable.hu/files/kuxesog.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/wajamoxikatipisorexo.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/0f7c2c9ffac2f823c29e296a9db2eb50/35047573996.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-11/20210511095309774064.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/fooltlhp03h0hb41ulise1ol77/ronujunorokunemutuje.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/38550513295.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/llcfq3uvfrtgckk9ojinijkepv/xamigutivox.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/66778859104.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ad9973868---95820654236.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/83041018877.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/sazaxikokelixabifag.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_off0000c13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13C 17052 bytes
SHA-256: 46d80ae7319036e0e67be3f63f4daac30c2b4e2525d855884a6beda7401a24d2
font_01_sfnt_off0000ed27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001053e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053E 11036 bytes
SHA-256: 0987eebc99551cfda2c4e1c4bff97bc57406139a190ab4e506cc5c691eede8fa

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