Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6dcb2f72a890164…

MALICIOUS

PDF

80.6 KB Created: 2021-07-23 08:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8b3136c5351c7418b1f829fc8387d838 SHA-1: 88f467ed0db74f39f2f8daa82a9e1241937be400 SHA-256: f6dcb2f72a890164081cc35a8bd42c2b4559b48e50ab329cbdbc449a3103a36a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests these links are hosted on compromised CMS upload storage. This pattern is consistent with a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://bhsbeacon.com/FCKeditor/file/35391661657.pdf In PDF document text
    • http://animationcoach.com/userfiles/file/92412602572.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/587b78f3615c072d3f3f6ecca8856300/66201635774.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/tegebirubul.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/jagetosoza.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/ninupifonosuguwiken.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608324f7582ce---11398272105.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/tusugugekonameworesutexo.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609712a16ff4f---janabasel.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/mekedexubarerelofemi.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/lepodedujilulo.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/30eec7911c778f4b54b40d74de054604/92044569336.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094b94398896---dupeb.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/zoruxikonisizuwar.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/duzutizokanudaviju.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/75054585143.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/fefegewutepoxosuzevaluw.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/6f055a2e1ab98005738684f2e5412e16/94322959013.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/gikanepinopeg.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160949d39a0c9a---765515260.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/eae53f75a43bc5dec502c254ddd60694/27866880353.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebb0bdef86---35572070819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=aces+up+solitairePDF 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_off0000d7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 17080 bytes
SHA-256: b13cbcbb218a8a12e23bee7f5873fbc390ac4cfd0c545de24106ca00c38995c4
font_02_sfnt_off00011c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C92 10344 bytes
SHA-256: 8a4902c6899e9ce9e291c67b6b01e24c1eb627ac2e61a285a129806861e2db72

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