Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce3485eef66b973…

MALICIOUS

PDF

74.7 KB Created: 2021-09-13 23:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac0904fae4dbda118c12f0b600890c1e SHA-1: 7e1a5aee2e6bd1650e130c3687223bf7d5931deb SHA-256: 7ce3485eef66b9730871a072f2676048ab41db15e922cc76e3b71cb13b51d232
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious destinations, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/7hgv78r77bpsmpvv8eep7oft88/bumerejozusa.pdf In PDF document text
    • http://jrpst.pl/userfiles/file/61881481120.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/zitoroja.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/pawusizema.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/91106065431.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/k2vr86li2fsp0i9o369mtnupat/80825860444.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/sapopuroxutoxigezoxir.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/latajevibuxenapez.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/nenosokunovimub.pdfIn PDF document text
    • http://scro.ru/pic/file/vedixade.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-2/20210902022436750064.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/tokovadijejoxutasapu.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130999e395bb---tafijumaxokikamexifupob.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/27489326634.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/85899534375.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/vazijexetudonisofarizaxol.pdfIn PDF document text
    • https://mar3ol.com/Files/files/22348029651.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/pazelaruxudavan.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/5876gkcvrrf0gvpi98ml2ao803/bisupikelemiriteriti.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/3fc3jndgsd8a9acvuhmprpcc5n/19597549849.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/tuxuvanalugotikowu.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/65961959929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+use+google+pay+in+rooted+devicePDF 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_off0000bf88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF88 16948 bytes
SHA-256: ef4e6f970388075a59b7a5ad0234c2ab1e3a8d07be03a9a290db6699da64993b
font_01_sfnt_off0000eb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB88 11048 bytes
SHA-256: 64debacf40231db7f6b7f01f08ab89de6953dc73ebcefaf858c9fea6da5e9e72
font_02_sfnt_off0001053c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1