Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c37566fb83f48d…

MALICIOUS

PDF

135.2 KB Created: 2021-08-21 03:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 31de2a627f1c07aad89009413bf2524b SHA-1: cc7d1ab6027df9ba628d4bccbeb7d121a01cf575 SHA-256: 84c37566fb83f48d286e035317df0764eb81ce1713a5e10e28ba691bf1a3c0af
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristics indicate the PDF functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to manipulate search engine results or direct users to phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9301

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://islandpointfl.com/userimages/vaxufipow.pdf In PDF document text
    • http://homeopathyhongkong.org/files/58879098793.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/39305391194.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/88284318897.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608726395cd3a---92748499704.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/56451262791.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/segemuvazuxi.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/295ec8679748b9d38a41352506599207/3834789903.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24c0975a0d---rabewitudazowepu.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/72786547591.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/boxamuwokubofov.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5f1b91fb4---luvusog.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608480cc12820---71979016898.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/76511138514.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/66889261443.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/rukidofifiwolefirovevof.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1627423930.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/aab9ec8d7ebe0c901109caf762ca9b3e/37552918273.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents//files/81705639367.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/xobesowurazix.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f94bcd6618---gixebafifiburawudalutew.pdfIn PDF document text
    • http://texmet.pl/userimages/file/51774641908.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085d43be8739---pikoxokiwawitetujizobut.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/4c2532aafef6d632ebda3d02e238c7f3/20385474314.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5b32c6ed4e0a3bd89604017e135ef0b5/83051488557.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072d39b3e9cc---52702401638.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=blueprint+reading+for+welders+9th+edition+unit+6+review+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19255 11420 bytes
SHA-256: 31ef9a2368f4365575ee5ac238eeac48f896a70d71fdf799855fa2e0dbc9dcad
font_01_sfnt_off0001ad0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD0E 16244 bytes
SHA-256: b1ef7b52ed35dfd01120c19ee4193d967dc828f2fc549fe1a2d8c3c5029b4647
font_02_sfnt_off0001c2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2F6 19268 bytes
SHA-256: 7c660f91b4165985fc2313c289cda22e9c6c0f64641604157b6ce007c5f16747
font_03_sfnt_off0001f5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F5B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1