Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9d7e42aa4c1f9b…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 02:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c8f8fbb004c04e96201540f922f086f4 SHA-1: 559c392ebf5a179ff36721c97a3da9de76012a41 SHA-256: 1f9d7e42aa4c1f9b83f5c993f523d301fbd54fc322ffb6d7b2eabc25dfdd571b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://sns.hu/_user/file/tubakozoxarolixawob.pdf In PDF document text
    • http://tortsurprise.ru/upload/redactor/files/lomawonefojinepimul.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/wironajujemobi.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/rujesemoxadovetat.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/nomojulasabemonod.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161413aa2502a7---nesisevigufetofera.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/jugubodilavolojutejoda.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/22618479371.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/88043454338.pdfIn PDF document text
    • http://balticstroy.com/uploads/files/riwozodu.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/wizekikepugolizupod.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/26659402407.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/52834212704.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/mafagelegazadabajit.pdfIn PDF document text
    • http://staropolski.net/Upload/file/91290535401.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/16/647987100.pdfIn PDF document text
    • http://csc-027.com/userfiles/file/20210918060735_e0utbz.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/ferimaroxivavemativas.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/34301939465.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/4340578232.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/ac63698f3360939396ee9eaf0d4909a9/fivojezufesenogif.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613405840a051---16609762913.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/50494718440.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/vemiwejenevipojokata.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+recover+photos+from+broken+androidPDF 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_off0000d4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D8 19288 bytes
SHA-256: 04917f391ff8777f6b75ad249c7186c284b6b777dfe4e728e07d9360b3c47753
font_01_sfnt_off00010699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10699 11212 bytes
SHA-256: 606e54780c049eb8dea77e041084ad951f3df9828b1627731d86425f0083facf
font_02_sfnt_off0001207c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1