Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdce6d2d77314900…

MALICIOUS

PDF

85.9 KB Created: 2021-09-17 00:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 123bcc904d45632fd1615bba167f0c7a SHA-1: fcdb6a311addcebcaa8f0f7f45eb9ecdaf58a5fb SHA-256: bdce6d2d7731490013bb15418330b3d2c3b6cb9239e1d2718cb2097888a7b64b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised WordPress sites. The primary goal appears to be SEO manipulation or directing users to phishing content, as suggested by the presence of UTM parameters in some URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://archism.ru/uplcv?utm_term=wifi+and+data+not+working+on+iphone PDF link annotation
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133961ba8b87---rakulol.pdfIn PDF document text
    • https://ccskin.com/geektic/files/38973038144.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/jemufiwurosu.pdfIn PDF document text
    • http://meskerjager.nl/media/files/tobovomatepekurawo.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/revunuwodukenote.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/34936685027.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/garigilemokelomariwupa.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e56164f73e---95161427801.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/57759727522.pdfIn PDF document text
    • http://glassick.com/userfiles/file/pofatubop.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613469d0310a6---kepowiwowodidozek.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/58177868523.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/kesawexujutipafawaluga.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/13298373879.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161378549af85c---loduz.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/43728212824.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/45602558205.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/babibitafaf.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/53760151846.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143a0b24c976---65041553849.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/3i6cut7pid2dddieq1kc443khr/gasitozofigavojipivet.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/sisajube.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/wuvuxumikonarini.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136854ed1342---jimebovukilesevexok.pdfIn PDF document text
    • http://msiutilities.biz/documents/kifoveleso.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210902_C3AF3874CE4E7600.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_off0000e7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B9 18772 bytes
SHA-256: be27f5801a8f6ceedacab12f02fef4d74d8a1c947d76fc5b9c59c5ea9a8aab6c
font_01_sfnt_off000118fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13111 10732 bytes
SHA-256: 4b18b61a53b69ba7e4b19643aaa96db1759dd618154a21d15d848b5b4f03422c

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