Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5dae250ecb55dbf…

MALICIOUS

PDF

86.7 KB Created: 2021-08-09 02:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f0129b9118831dbe3155fc7b0c2e6bc5 SHA-1: 9bf243fa1f9e2eee6983089616f9b0d4ab0cecf5 SHA-256: c5dae250ecb55dbf54854edfaf1f850357f39b58d0cd5a9ba80f8ca079063b32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://feldbach-tourismus.at/files/81276517816.pdf In PDF document text
    • http://www.yt333.com/userfiles/20210801/file/1627829095.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/vibamudesemawati.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/m2524sv6lakv1sb7a7regh91r5/79197886055.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/kowaz.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608014235d728---xamodupiwirapulelabo.pdfIn PDF document text
    • http://altinay-law.com/images/file/859845546.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/70139420837.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/todaloge.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083e302d6fa7---58569906758.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/278235f054eb30e234af7554679d4f28/kefakeri.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3435182069---57486302727.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/rhjcdbltrl1cmpnioh089q6ss6/98864296744.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/rngh89e6t549pbq5m6suqmu382/25225538699.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/56803226929.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081881496c72---82139666023.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/kapeviwezakizekimudujigox.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/16137139512.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/xeveveliw.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f217c3f774---witobozasidodi.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/rikikesukuvizanivo.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/betajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=building+maintenance+schedule+template+excelPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAE 10996 bytes
SHA-256: 195ece68c4286f6eb052165370f98600d4d8456a49cfe82b563a5cf7ce74f7de
font_01_sfnt_off000108cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CD 17068 bytes
SHA-256: ef31400849d5da664174624e5a4217f0d4a512992f05932c8f1db44ba9ee0940
font_02_sfnt_off000134ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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