Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff0e0f57f2737f2…

MALICIOUS

PDF

88.7 KB Created: 2021-07-26 13:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45e8206cea0295c298022b806cff5cfc SHA-1: 9e2fb0bc9b2f1b2041d9e73cff068d9f6a9057de SHA-256: 8ff0e0f57f2737f212f1eadb2d70045ba8e6f1a3a68cd3ba87bd397dffbd1e40
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body is unreadable, but the heuristic firings and URL analysis suggest a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://okeefesreef.com/ckfinder/userfiles/files/37712088498.pdf
    • http://fotofolliasanlazzaro.it/userfiles/files/suwib.pdf
    • https://stdtekstil.com/upload/ckfinder/files/fulogasu.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bd9594dbb---86339770231.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/252d1ae6cf67b3356de85d32c5a28d3f/58841441023.pdf
    • https://jobtiara.com/files/files/23599084374.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962e93e3571.pdf
    • https://monographie.com/ckfinder/userfiles/files/51323724047.pdf
    • http://kronikarp.pl/ckfinder/userfiles/files/zuzadene.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/d73fa0d5628a3cf20bdd8cad9042c16a/83740074778.pdf
    • https://toolsatool.com/userfiles/files/21715381423.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607429ccb42db---29703716143.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb43f5373e---reredibexek.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/bd87d676169ba0bc63ba6c19315362b4/kobuz.pdf
    • http://adance0112.com/upfile/editor/file/vivumisedam.pdf
    • http://whalesart.com/uploadfile/file///2021060904235010.pdf
    • https://alarouba.com/ckfinder/userfiles/files/jaturidu.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087076fb36b5---lemudugakinevam.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16098e86f0a052---sotovitejasikaxesa.pdf
    • http://sartor.ru/upload/files/73008990795.pdf
    • https://psychotherapie-coeppicus.ch/userfiles/files/davoledegapavuwi.pdf
    • http://stelmart.ru/userfiles/file/jinusuputufax.pdf
    • http://goref.ru/files/file/81265004712.pdf
    • http://trungtamdaykem.vn/Images_upload/files/reporojerixu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+joy+of+creation+download+iphone
    • 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_off0000f3e3.bin
2714c0b701c73adee246e96c60a90823450f7ef3882bf68ada257f19142bd734
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 10840 bytes
font_01_sfnt_off00010ce0.bin
1f6c0a97b4471c6b4f0f5d09283db434c52987141adf9b53e9a1e8297f9cfbfb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE0 19632 bytes
font_02_sfnt_off00013c4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4B 16792 bytes