Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4318cd8cf23f9e…

MALICIOUS

PDF

71.2 KB Created: 2021-09-03 05:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c04d19df59aa2d394b1072f14ab99c3b SHA-1: 512c7356b2ea51d1791fe5db114ba4c7d51c82f9 SHA-256: 2f4318cd8cf23f9ee1080b5094fedac52de82908734a75a65042b2a8075268b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites, suggesting it's used to redirect users to malicious content or phishing pages. The presence of external URI heuristics and compromised CMS upload links further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://smidgel.ru/uplcv?utm_term=peritonitis+definicion+pdf PDF link annotation
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/994c20ef6410088af9dd22bd679297ae/40004577186.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/sowefirivuzivonowax.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/f400234db15f5a75b9ffb1eb24680083/rotixuniniwomozen.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/xewirajidufiwalokuga.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e64ea7e317---zuwumuwopopes.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c09d04f0c7---xanufame.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/jafakof.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/vaxexutekiragijiko.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/fejodazagimaxunotiweg.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/wumaxoganusesajavonujo.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/27467536004.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/32138488960.pdfIn PDF document text
    • http://prestopc.it/upload/file/repaparivedujato.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/dudodawaxexetezofoseka.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/bo4ao7fip8q2v05iv8gitf8fbe/20922027301.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/52662642327.pdfIn PDF document text
    • https://naves.cz/res/file/43888867602.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/f6e61250d4b71d158502b79b1bc3b5ed/kokotibupekotilapukalugen.pdfIn PDF document text
    • https://hirurgija.me/files/48753898407.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/tdiffnm5i8vb4h637kmv2aq4q0/zewosipifolonomosi.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/bumapobija.pdfIn PDF document text
    • http://halaljones.com/uploads/files/malabifowirozejon.pdfIn PDF document text
    • 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_off0000b4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AE 10408 bytes
SHA-256: 09fb8bd4c744fdced3c15edba1c27d3236059f858f0b56f195b40fc1bf330110
font_01_sfnt_off0000cc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE470 16000 bytes
SHA-256: cf0fa04bdf2f50121b5a65434b68b5b9f447b069666917ca463cf6e5c70ef8bd

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