Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc39b5a9ec837b7…

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 05:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a3b0b7cb339d1fd19d365c1d99137f5f SHA-1: af09b84c278cff4137fdc6d9e21c1e213f9f4525 SHA-256: 9dc39b5a9ec837b7cac107c737d7e10c6eb9f8b883938b9f03630c81b40429e6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d24b472da4---favuno.pdf In PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/62484608224.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021072700501073499.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dfe2bbdeb---47288222587.pdfIn PDF document text
    • http://stromzeleny.cz/file/zevawuriwewafivugoxij.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/xitavaxani.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/4a58070c291912aba58f91cb3b36f398/23844261089.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071de597869e---62891309864.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/nugibazejukitorep.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/munetuguxusemi.pdfIn PDF document text
    • http://newmob.it/userfiles/files/motebitojivamizijes.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7da3a5d7b8---96760084977.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c149ad3f415---4464403933.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/ralusivefazesejev.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/tekufugitijeneg.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/73864874950.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/xajewowow.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/f5udch21eu6t96e46ah38jjb65/fiximevedexemorez.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/42bcad5d211648535fa2a714abfb730e/73704726825.pdfIn PDF document text
    • http://progetec.org/userfiles/files/63368404054.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/81600820911.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///24503330721.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/rireguvonivara.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/93363932899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=bcece+previous+year+question+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_off0000ddb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB8 11044 bytes
SHA-256: 72622abd6586cdea5c688f3f98cd96092e36a1261e88cf9fabf691cfc9396163
font_01_sfnt_off0000f775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F87 19076 bytes
SHA-256: 7a30dfc32028d68e45a19bf7a9970b473b3396c6d63ed2328c3a06b4d1a07cfc

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