Malicious PDF — malware analysis report

Static analysis result for SHA-256 634f2686b8063bef…

MALICIOUS

PDF

79.7 KB Created: 2021-08-26 14:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2b2ea750541854d8f3d7643084341128 SHA-1: 8902bff1d9ddf33dea1374bb6cc6e081a7c54fd7 SHA-256: 634f2686b8063bef0ccb51ceeb4be91da77980cead560687945ba18704f035c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to various URLs, many of which are hosted on potentially compromised CMS platforms or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious files or redirect users to phishing sites. The presence of a 'Download Button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://saxonrt.hu/img/userfiles/files/89977497622.pdf In PDF document text
    • https://martabaktelor.com/contents/files/gotenusinevemejogexaruk.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/31157658601.pdfIn PDF document text
    • http://markone-tools.com/upload/files/43955400104.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/11532724318.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/b7cee49a2e9344268fb44a05526bd9ee/nixezepirosegi.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a17838e882---siberetulupofosikes.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090220f36bef---276086292.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/nibefoboxoxafotexepew.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/mcju6jbt75cv0c48k22gkfbd97/sudejel.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/60329565222.pdfIn PDF document text
    • https://stopserv.ru/files/file/71019687183.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/70405358128.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078354382d53---56222927210.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/050731269902.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126b58168ed4---28807632812.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/73894909878.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/mevirasujigeduwaveg.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0dac7c3ff---nasolumetumaju.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/37281194376.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607069d9aa31f---dogib.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d92ab39bd2---42068665510.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bffbb7bba8b---domabapabajituwapowuli.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/6514365031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=uppcs+previous+year+question+paper+mainsPDF 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_off0000d263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD263 16996 bytes
SHA-256: 1cbf5c181179ceb43d9c005913de3f66511cd97a9f50627eae289da05135de29
font_01_sfnt_off0000fec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC8 10924 bytes
SHA-256: cbef0a4b2f6a53886d698f613b1a7ac3f08afde3a752d7db9277998d65d2ff99
font_02_sfnt_off00011826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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