Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c7560a169e14c8…

MALICIOUS

PDF

74.7 KB Created: 2021-09-18 09:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 41af466a863f730a92726f8156ba8272 SHA-1: 2fc67d6008c2e1c447e18f600a7b506483629ce8 SHA-256: 42c7560a169e14c8fbfb36ddeccfc8fb0307f907bfffc1d9087a93cc14595128
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, embedding a large number of URLs that lead to various websites, some of which are hosted on compromised CMS platforms. The presence of multiple embedded links and the ML/ClamAV detections strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://swapnakoodu.com/fck_uploads/file/84268457854.pdf In PDF document text
    • http://osteriadelcampanile.com/userfiles/files/pozuxigobu.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/61099280296.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a43e5db3ab---nerog.pdfIn PDF document text
    • http://soupworld.de/upload/file/tojubeludaditiwijamizom.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/74312418918.pdfIn PDF document text
    • http://www.moyekolodin.com/files/xosuzedepanifon.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/xuwodimefaxolet.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/50398954959.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/5193141727.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/coniudddshs9n2dq84ajrr8c46/11758418954.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/worenafebuwebozezevurotex.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8958eb871---jikedavilopefujarofezafu.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/88706058167.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161373f497efba---xavazonidojejeruxedoj.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/refif.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/99814279165.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/8883528421.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///43430855141.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/nimativi.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/7487221005.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb8d9d752e---34731627180.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/sexodemimeziduna.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/94410451285.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=roblox+coins+hackPDF 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_off0000bdd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD6 10376 bytes
SHA-256: 13ad485c5287281ea5435ea9a98c30083c663c182e053b5337ebe4951f105ba9
font_01_sfnt_off0000d535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD535 18316 bytes
SHA-256: 7b9020d3664b853a1391872a7bfb60bada0fad9ef26fbf1108eecc7734430b56
font_02_sfnt_off00010541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1