Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd65424db3f0f05…

MALICIOUS

PDF

75.3 KB Created: 2021-09-20 10:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1a2344a93228aaa44709f89da9dd60d9 SHA-1: f26208b7ae147687f9ea4d98f9cdf4b7cda7058f SHA-256: abd65424db3f0f05f439dd4511a74c55846ba273e8e1afefeb35b6cbecfdb9f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://kominove-centrum.cz/media/files/file/8928818656.pdf In PDF document text
    • http://primaneighbors.com/userimages/51936058398.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/71067802343.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/didiwenakif.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/96339495411.pdfIn PDF document text
    • http://kmsenior.org/file/files/66005692161.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/94075380260.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613fca20076a8---46328198100.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/gotirimuzul.pdfIn PDF document text
    • http://horvathortho.hu/tmp/ripugazun.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143254288c61---wizifalorawakogo.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/gurov.pdfIn PDF document text
    • http://ecoevopublisher.com/files/upfiles/file/lanim.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/57698038462.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/nuzazovepora.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/nokakesorekubevor.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fc9440e8b---rebenubifuganujumoroti.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/solezerovitofoxoxagu.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/wejewisaboz.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459cce01bf0---sogovabisobotipalu.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161303c5a4d1c1---95303756996.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/20194714949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=launcher+minecraft+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_off0000c564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC564 10584 bytes
SHA-256: 8b8b11effdfb13e571c9b02604bed27cd0433da3c6ca924e242223823b9df7fa
font_01_sfnt_off0000dd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD54 16396 bytes
SHA-256: 56302d9591349dc0189079d6fe3b1034e7f3eae7cdf6986769fc2e07d988234a
font_02_sfnt_off000107cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1