Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4cdf41b985048bd…

MALICIOUS

PDF

78.8 KB Created: 2021-09-11 08:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 813fb7b152a2a8afd967982b3135b1a8 SHA-1: 1064538975c37490e307e712d88ba6939992c015 SHA-256: f4cdf41b985048bd1c245e4269730a9d1c03a2bfda4bc64a740d2c9da96aa13d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple link farms and a high ML score suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infosantiere.ro/userfiles/file/zigubig.pdf In PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a85c574e9---87689990156.pdfIn PDF document text
    • http://telektrans.hu/editor_up/97811366086.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/36260562213.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/27458868770.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/xubibupugenerovidu.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/delupupiloje.pdfIn PDF document text
    • http://www.77ice.com/upload/files/paborasuvun.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/53498158551.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/pojuvatekotesibebo.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/sazagobogu.pdfIn PDF document text
    • http://vititanon.com/user_img/files/6044560160.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/jovikenumagago.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0c76daff2---zuwuw.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/sijukujebanapukudeg.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613748dd76859---tisaguzofujas.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/66936309528.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/sivewivinam.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/xoradizixugodadogefive.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/nibomutaju.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/29516289176.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/fefekal.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/56862780689.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/doweboz.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/24004071370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+recover+my+data+after+factory+resetPDF 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_off0000d145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD145 16728 bytes
SHA-256: 94c3db2747253997f9fd00a7b3894075b4a96a56f2ec431ebf9dc0017c40615e
font_01_sfnt_off0000fc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC75 10652 bytes
SHA-256: fe040b041f5c3397909c9e33ae8877c6cd5def475c89ef9f2a9d2e9529374e45
font_02_sfnt_off000114f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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