Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f28176cbb131e13…

MALICIOUS

PDF

136.1 KB Created: 2021-08-25 20:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4acd3bdf1f78b0bb9d55377f9031a351 SHA-1: d46ceddff4fcf1ff38ebf244694b3199bef8d32e SHA-256: 8f28176cbb131e130621be42097092bc403bc8ee62d180d6c0295a3136f38826
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure indicate an attempt to exploit users by directing them to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://atlastoursntravels.com/userfiles/file/56964680082.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f88344ae3---vekofiragitujavef.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/53814565026.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/92b6f9e2ce00c069b226d67308c93520/konibon.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/kupodevasezupi.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/bbupsjf5j40narjkfknu6802c7/dixutujapojofubegibita.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/69026832004.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/77987931762.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/sajidiwusawodomi.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087366686be0---13610264814.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/butagekibaripuzivekuxaki.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610da431e2dbf---giboloni.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/65948742949.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/sijavov.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/zafomorikivobaxuwoval.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/30805916199.pdfIn PDF document text
    • http://juliesfundforkids.com/clients/d/d6/d6f17a7a4e9d342a12f8f8eeddb80b2d/File/velebukix.pdfIn PDF document text
    • https://harom.ro/files/file/66530073270.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98b3cee99---49468828584.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/28945927009.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9e43673ea---pigesowu.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bc2a9852e1---62276891623.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/iaa12tpjsc5bjm5b4lpfs62j44/tiverir.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b64decba9bc---18872334346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=eastenders+max+and+staceyPDF 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_off0001b271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B271 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001ca83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA83 17604 bytes
SHA-256: 7023c6171ae83e9cfe6a9a26706202cb7716ae8de1d613c1232c7f60e86328e8
font_02_sfnt_off0001f883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F883 10472 bytes
SHA-256: 13a40a279287c13cd16f2ae0f12aeb773ffffafdc121ffe56d2febc44fbd6b42