Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e546c59589daf5…

MALICIOUS

PDF

88.5 KB Created: 2021-09-17 05:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1f66fda100497efcd048213aa5d1ccc2 SHA-1: 7df79b034950889ce40920e7a46c59cdae0d3011 SHA-256: 79e546c59589daf5c4629e3030cf8b40608721832da5b16066dd6f54bba69000
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, a common tactic for phishing or redirecting users to malicious sites. Heuristics indicate the PDF is designed as a link farm on disposable hosting and points to compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://queure.ru/uplcv?utm_term=top+rated+kodi+builds PDF link annotation
    • http://krr-nfe.com/suratnfe/UserFiles/File/32656047559.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/watakezum.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/59275797046.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/23483661396.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/wobawagajeseke.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/rumalerosadezamo.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/26143585613.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210903_031208.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/vaferewararugubada.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139421f89ee9---65387873138.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/50991376872.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/wozunedezaxes.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/tizulapemitabopivaz.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613082e125498---wawemizufinafobiwinof.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/86466490631.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/90316418805.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/zaruxutepaje.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/88774408979.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/mopiw.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132cd4a679ae---ximuz.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/7491495700.pdfIn PDF document text
    • http://pronobile.de/catalog/file/roserugel.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/69590938307.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/uiur3ns9dt4palndmdh53hsuln/42989724652.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_off0000f61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61E 10576 bytes
SHA-256: 374a688fb44a828e1826f1cf5ec1a8f5d22b4ed01dcad3a7e968bc31433074f1
font_01_sfnt_off00010e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001263e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263E 17924 bytes
SHA-256: 923ade7e15687eead3eb7b446a0a1213a61e6895af62687e81c697bacea97b80

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