Malicious PDF — malware analysis report

Static analysis result for SHA-256 3595e8e6c398d066…

MALICIOUS

PDF

85.8 KB Created: 2021-09-01 03:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eb47891d99a1a650fc8c97e4d72e13f0 SHA-1: 347ac5ddbcc0e1fae4bfc6f0013ade3b72076275 SHA-256: 3595e8e6c398d06657fdcacc8122f7375dab4afeefa297e0d7cc3a7bd60a153f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the 'Visual download / call-to-action button lure' heuristic further support the phishing and download lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=last+year+bsc+nursing+entrance+exam+question+paper PDF link annotation
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0f0746f8d---nixonatirabusurirasirez.pdfIn PDF document text
    • https://shopabrang.com/images/files/nojomidod.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/dakukokimugol.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/libobomim.pdfIn PDF document text
    • https://schlosshotel-murten.ch/userfiles/files/67390177730.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/71507533774.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/1481891956.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021071707451473499.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/53515933948.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/bbceaabebf62a282662554d84ab56564/9096949411.pdfIn PDF document text
    • http://summithighschool1958.com/clients/71652/File/laganudivopovupidevum.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/durefakirafukis.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/12603953949.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/h4m1bbg31bgorsajqd0oqilcei/doxevif.pdfIn PDF document text
    • http://go-forum.cn/upload/files/54768051324.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/8353b9672e7fa88b9bfbc39930dc93b5/50000594612.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/o4t4c9jhvrm54bb2cup47nme12/sakofulifiwegade.pdfIn PDF document text
    • http://reflita.lt/uploads/files/gonatekowu.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/33457724350.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/95418721793.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/25171513985.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_off0000e7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10012 11232 bytes
SHA-256: 8ca8439cbabeb1059d1895141fce92f80ef7715a4c8121768b4634a953f07246
font_02_sfnt_off000119f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F6 18096 bytes
SHA-256: 361a5588a2010813412e5d1fcf117494b9bff69b24e518ff3aa8c029a7321935

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