Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e1399e7aa4c237c…

MALICIOUS

PDF

71.7 KB Created: 2021-09-18 14:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dead25b1bb99609fd482590a8caacaeb SHA-1: 1130d208e8008a6cd103a08f9279fc3b3d2e2e91 SHA-256: 8e1399e7aa4c237c3ede4872b8014dcdd81b64731285a0ccb40d860c031b76fd
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 a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting, likely intended to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abf43ad431---pedenulosisuwow.pdf
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/10722142734.pdf
    • http://toyotarent.tw/FileData/ckfinder/files/20210902_7BA74F8C1B725710.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/h9816l093lnqm0r661aecap963/revezesakikev.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c60bacbe1e---wazegatupo.pdf
    • https://stotex.rs/files/53802477569.pdf
    • https://agrocare.ro/ckfinder/userfiles/files/11806251507.pdf
    • http://productinfo.in/konadnew/userfiles/file/fojokasigarejineziz.pdf
    • http://hostingureitings.lv/uploads/userfiles/files/tosudevimosisul.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/4253e7135d614dacc6731b7c4992e5f9/judezovinowa.pdf
    • http://sinice-rasy.cz/files/file/95955162179.pdf
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/74916909386.pdf
    • http://studiorinaldibedin.eu/userfiles/files/doboxujepezizesarisodo.pdf
    • http://streetnn.ru/data/upload/ck/files/kizubetalukivepuja.pdf
    • http://abcgsgeds.friendship-match.com/upload/files/56369544579.pdf
    • https://fokusmedia.com/images/uploads/pefuleluveze.pdf
    • http://archgeo-leszno.pl/uploads/userfiles/files/xikulixo.pdf
    • https://santa.my/images/users/00000000/files/gigivur.pdf
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/4e058947b5fb1902b158627feed81695/85308732297.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2f7ec6b8a---47623573822.pdf
    • https://aprenda-atdi.com/uploads/files/murep.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134dfaca89f7---pepobebatunibedej.pdf
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/55723321704.pdf
    • http://younewstoday.com/task/userimages/file/vatutabilalililopomojuf.pdf
    • https://tselectromechanical.com/uploads/CKfiles/files/78091495347.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=tetris+game+download+for+android
    • 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_off0000b9f1.bin
9dd940d8f8765e135382082118f49c28cc1881ba97abf7496adcaaf87e9fc716
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F1 10744 bytes
font_01_sfnt_off0000d284.bin
2ab92913b85311aba0f3618e0a3fe07154fff99c429a55b42680a65e1d15d4de
pdf-font-stream PDF embedded font (sfnt) at offset 0xD284 14976 bytes
font_02_sfnt_off0000f864.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF864 16792 bytes