Malicious PDF — malware analysis report

Static analysis result for SHA-256 7716420c1d332e1c…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 19:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aa7ed3e8f09f8c294a8ef8a7dbe2de11 SHA-1: bdc2305a17c693ee8b28d7fd02772af79d9e6931 SHA-256: 7716420c1d332e1cc1e02072e90e1bdef1cdd61d6133bc7539e4d687ed9c3b14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=pentatonic+licks+piano+pdf PDF link annotation
    • http://propellerclubsandiego.org/uploads/files/disigubojemupegesorev.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/94871347893.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607789ba92478---wufun.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/24166830554.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/a95fd0b07fe1480b741d13e33c303b42/96012862802.pdfIn PDF document text
    • http://mooneyes.pl/userfiles/file/66467900384.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/5975079243.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/25458943664.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/ecd517cb9ebddec70e624acb34370297/10108029657.pdfIn PDF document text
    • https://langumeistras.lt/i/File/fivew.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/6593322191.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/kapejosok.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/66952799604.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/63938377928.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611612068835e.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/0a66f2c0b8533e2a99a82b9f6a990693/felefepeluxurik.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/tarujaxudanemelifewu.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/bepigakir.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/69258321135.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/56115711483.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093adb3b151e---sudinuxixusukumiwobukoset.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/14688889070.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b6a34f47---71779537274.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612acc8caa46c---zesakobapa.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/detaxinofired.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_off0000e058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE058 17668 bytes
SHA-256: 4ba110eaf1f7c4ee35ba48677874817f376a6a4e42f2ef743d5aaf49a9844be7
font_01_sfnt_off00010df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001260d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260D 10608 bytes
SHA-256: 64d8dbe3442153f28759138000bf8854bc0c1176da9651da56f140ce191deac3

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