Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a83d6f4336a4840…

MALICIOUS

PDF

99.5 KB Created: 2021-08-04 01:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 084dd0fcc70a39fa072bb624a010a586 SHA-1: 4cdcbed908e9cb2b1050a24f43ca0e7f39a00e6d SHA-256: 2a83d6f4336a4840d32c6e6f3bea3308fc2edb3e7e5c892f4c87024f7324a7c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://tms-operation.com/upload/files/16619079323.pdf In PDF document text
    • https://artlabjo.com/userfiles/file/42759342854.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/resefevituxifawuzebugebej.pdfIn PDF document text
    • http://surausa.com/uploads/files/21433822165.pdfIn PDF document text
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/luvexajosa.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160934fdc95e04---70780544790.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/rapixuzapewumuwu.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/xenuwunegunaziz.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/gttj95sbviqs808fhd9m92ekiq/webigujifamigawisozod.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/mupatifodibotupokatezu.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3331b65f4---91016493026.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/subodimejozelivoporifu.pdfIn PDF document text
    • https://fallsplat.se/file/kiten.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7bd25c86a---17759922702.pdfIn PDF document text
    • http://devison-matras.com/upload/file/litulam.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/56229202406.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/49gf02moqurajgadpnrj6bkt2k/lavofobavogunevumezepofew.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f16ad0ca8d5---91069596666.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/kexogexekomemozerasoke.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/62916184185.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/tevafigajos.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/2519726922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=hcf+and+lcm+worksheet+class+6PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001088b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088B 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_01_sfnt_off00011dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBC 18040 bytes
SHA-256: 15be0da16effa2f4bcde316b7e72c378b6457c258b999418b64a6fa6c637f22b
font_02_sfnt_off00014cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CFD 10984 bytes
SHA-256: 52a83b3112b2494afc90d36295bb8fb82195259e5b70c0f9a48ca1e6c41984eb
font_03_sfnt_off00016666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16666 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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