Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e9e9085a8547d89…

MALICIOUS

PDF

82.5 KB Created: 2021-06-25 13:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f412e1874a847313f2dad3c62661bb7 SHA-1: 7495e25222a5192b78d9330f44b09d36cfa449f3 SHA-256: 9e9e9085a8547d89e476b23f6751b111b97043c4493b5b058178719d0083dbba
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content or exploits. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a tactic to distribute or obscure malicious links. The presence of external URIs and the nature of the link farm point towards an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://hospvetcentral.pt/site/upload/file/potiroxid.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608609f5a91d1---56097539836.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074573ce2f53---fezixug.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e992e915f1---89150724556.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/ap7si0ugge7kujj4op0gn0te9k/42768800113.pdf
    • http://decom.pro/admin/ckfinder/userfiles/files/326827784.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/degukupovinevir.pdf
    • http://wellfoto.cz/pictures/files/18720543065.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/ce965fb8ba0181e1da7f48d743de5f77/1746370667.pdf
    • http://architects-desk.com/uploadsfile/16550328927.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/c44oag2dns8al0hmmcljis2sop/zisetu.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/15jtroffseapnpnh01fcgbc13d/2055912395.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/iq88qv12mshor4ifo7fibo6m22/dulofosisidi.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16081b0c38cb02---39714153382.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d45730cd5---81600478288.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=gta+san+andreas+android+cleo+mod+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfcb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCB 16792 bytes
font_01_sfnt_off0000f7e2.bin
6ddfe75990056592489decea45f50b88eeab1f2eac73fc34e069b7c4a096c4cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E2 10656 bytes
font_02_sfnt_off0001105b.bin
d5f851de7e58a376dc7493026a69be1df8419160d22dac5564195f9ae7adfd3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1105B 17216 bytes

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