Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c89e4232e298d7c…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 04:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a214dd6c3cfd1bc0ea44c7117acd0878 SHA-1: 9d65ed6810fe7432ef19f6c6eb05f8bb5e0fcddf SHA-256: 9c89e4232e298d7c5699c85d96dfccd1aae4a0706ce7841b84751a35b8cdcad5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, forming a link farm designed to redirect users. The primary attack pattern appears to be leveraging these links for phishing or to serve a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f926be3f668---14258775583.pdf In PDF document text
    • https://kaisar168.com/contents//files/73224921468.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160829e14443eb---92589305638.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/69897092051.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/3f7383ae84c93632acf89ec5180622f0/naparo.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/levesojukufir.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/vewixikuwisukivejodu.pdfIn PDF document text
    • http://dichvuwebsites.com/media/ftp/file/32433407334.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/pevupanegabu.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a2746dbeb6b5446f230b1114ad923aaf/29015037652.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/favatobozajamav.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885a05cbb05---42794986814.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/e76a78a901c310ff6afe122ba3feb875/kitadevi.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16087a11bbc43e---jolilujozu.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/97596598299.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c559b64b48---9555432671.pdfIn PDF document text
    • https://trunglamdecor.com/uploads/userfiles/file/77480583779.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/kawajiresigawo.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/sulubumetubedarebevene.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16073989c1ca2d---vamomur.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/lawinodemuzujopej.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/72876876252.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/86818275720.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607964a42d5b7---wapijaferemaba.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd22f859f5---85743026096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=domestic+violence+essay+pdfPDF 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_off0000dbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBD 20700 bytes
SHA-256: 7bb350f47996cc40df55d8794ab9b85ca6c43fd829cde16ecd87eab0f53d6d11
font_01_sfnt_off00011150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11150 10864 bytes
SHA-256: 72d85b4099004666bbd7a60753a475e2c68425f95439b5f9516222fbb7325895
font_02_sfnt_off00012a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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