Malicious PDF — malware analysis report

Static analysis result for SHA-256 716da47632e6bd6e…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 14:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2e7da74bf667378f78fd39c9c55af561 SHA-1: 3d7c3ac1c5e75bdeffa173432c6397ba8ee41924 SHA-256: 716da47632e6bd6e6d4c22edba3287809cb3f6455bbe7e4ba80fe893fd53629f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate an attempt to direct users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=gostream+123+free+movies PDF link annotation
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16136d27519728---serewegawure.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e67d1e5b19---sejaj.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/60969264392.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130e5477c3b5---32248523281.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/sekarofamusilagavogik.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/fozinivu.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/lejunokufotuvem.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/98226175908.pdfIn PDF document text
    • http://erpos.sk/data/files/26630562571.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161437e0de96c4---vageziwuxin.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/69532408140.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/11959429695.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/22807805457.pdfIn PDF document text
    • http://deauville.ru/files/file/kobonakijegib.pdfIn PDF document text
    • http://benetalent.com/upload/files/kegeremulivem.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/xobedegu.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/25315797863.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/pogenexekagegidijuki.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/bagabevepugojepazus.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/58938830569.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16136127ed39bf---suvexa.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/ca024ee493722a22c5821213709d5e9e/4719990918.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/xaruxenewenobomawavojamup.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/4358703696.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_off0000d8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BD 10676 bytes
SHA-256: d080c0ec19facdb1590dc9a365532e8d0732530f95475d6deaca9cd0edfb240b
font_01_sfnt_off0000f174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10986 18724 bytes
SHA-256: 00c6744390dd65db62ff0c76fb50437d6c7beab1e9fa35f96753d0964ec520d7

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