Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d8508aa127a9e1…

MALICIOUS

PDF

83.5 KB Created: 2021-07-04 12:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64af5f5d417194eb4bec0960ea8db638 SHA-1: 5596171006410d6a66063e25a61da40d2f7c7219 SHA-256: 99d8508aa127a9e1c26ee8657e58eb4f9571edeb906372d15031c71dbd158a4f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The document contains numerous external URIs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdef85f660---70618482223.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/9050764613.pdf
    • https://okazdedziecko.pl/_files/Media/file/kubejilukibutoloxizuku.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3e9e71487---27904083001.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/64d94f1b9d8d07a10c2c8bc077738566/vexilekutilopuwesez.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/aa4b09f3a650699da2dfe75df525f1bc/disopexowedonobi.pdf
    • http://oryginalnedekoracje.pl/userfiles/file/83372656645.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160933d305cffe---xanekotolamuxokexur.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/9ec8a36a710803ad3e019317c87f84f2/robilisejexezud.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607e66541cba7---tuxuwegowabane.pdf
    • https://dermatologie-francophone.com/userfiles/file/99657763201.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075629b486f6---kesufiworatozav.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/xaredanubesuwevoxep.pdf
    • http://ketnoikienthuc.com/upload/files/jikeresajuwep.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c47ea29778---84948071181.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4859e62bfd---13716421806.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/792514504cae489fe3e0c69ec49a0a70/joxonipukurazuvemarawa.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad4fd0bb3e---leweganadijanagezaduka.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609829c7070a8---26923368665.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce4518ef77---jomibipulevolubitefarado.pdf
    • https://nhaccugiare24h.com/uploads/userfiles/file/28476197357.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a7343f099af---37266722775.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adeb18b5d54---vigivi.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0851c8efa1---datonufosi.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/q69eo6sfa05l8iva15458o7g4t/kejigadezogagoluguw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=english+rewrites+questions+and+answers+pdf
    • 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_off0000dfca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCA 16792 bytes
font_01_sfnt_off0000f7e1.bin
04be7e7dfdb3de65263c60ecb5553a99e1ba943d2ff7d0f29c86699115d21131		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E1 11092 bytes
font_02_sfnt_off0001112c.bin
fc13bf3662132b730c4f399d27ee0bfad144cce87d41e1148823ccef47fc19dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1112C 17928 bytes

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