Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf3004d1b59b070…

MALICIOUS

PDF

87.5 KB Created: 2021-06-26 21:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 677d27cce8a4c9fcdcdcbce78c94540b SHA-1: b90e1ebf49dfa22046dc6f24012921df4a1fb4d5 SHA-256: adf3004d1b59b0703a2a68c8828244b393755abd6284f4d442573299ceb9a8ef
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. These links are presented in a link farm structure, suggesting an attempt to redirect users to malicious content or downloads. The presence of a 'download button' heuristic further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://synerhu.ru/uplcv?utm_term=bcp+document+template PDF link annotation
    • https://rsun.pro/admin/ckfinder/userfiles/files/15477272928.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210621140645930397ldymod.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/rizowafamur.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/71133696883.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/13351322783.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/503a02bc45f103afe4c5597f61749796/lizobelugepakarupol.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/62885857499.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0034f1541---weladoliwasekum.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210623230512.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/g7kiasppnm8vm9i29nm3cv6u13/53652164446.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/nasebobisalunodomosopo.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3d638675a---95087311830.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/rqmqa0jm5qd3c9h39rana3qdk4/98425246339.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b7102d0c095---6572924678.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/8640242ef5a83f62d27d8f2f71cb6802/mofakusenogebef.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/15816334f8160636b601b770cabe28dc/sosofofufagilokolepeso.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a77273684bc---821892162.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/99v65b1bf8pers84ismrac0ph2/magigavomidedopin.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c1f0e7283---35129914992.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/mivufabenoxawuwotoba.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d313b29e0c---daxopafawemelunav.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ae1dac8dc---73544390175.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b71fcd099---zobawe.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/62877552fa55c53ff1d1c53e0e24111d/woxarijejutux.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_off0000f4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 16844 bytes
SHA-256: 16d85423de8fc856fcbfb592bf6666964a6dd08e4c1a24812a5682e7c9141d03
font_01_sfnt_off000120cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E3 10468 bytes
SHA-256: 5cd2cdb0280e0cf6ff0550aafe4623489dc174c6ad08defdb59e882194ecaef3

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