Malicious PDF — malware analysis report

Static analysis result for SHA-256 595ad90fe4fc6ce9…

MALICIOUS

PDF

86.5 KB Created: 2021-09-01 12:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ed2ce9b0ae2ee0196f1bf594c2a40e0b SHA-1: 440b2e41607d247d9350925451f6903b204fd778 SHA-256: 595ad90fe4fc6ce97d9a0e613a07162b3dc69811eb1ea0389c44ffc35a159a07
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised WordPress sites or disposable hosting, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://synerhu.ru/uplcv?utm_term=how+to+include+a+pdf+in+a+word+document PDF link annotation
    • https://bd-sokolovska.eu/userfiles/file/39538303951.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/66668677665.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/92544805493.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/e6c9517b96fba0bcebdc75fc51679858/delezanibopoludix.pdfIn PDF document text
    • https://kaisar168.com/contents//files/73224921468.pdfIn PDF document text
    • http://mqskin.com/luutru/files/zupezisamaruvonag.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/12686595858.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87e00dd55e---tixalosudivodusanivuvap.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/29001780613.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/7c9d2df270920ef5bb7dbe76225a9f3c/siwidobit.pdfIn PDF document text
    • http://proxima-design.cz/files/file/mipudajanovotiwamivifel.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/21794346352.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/jolevedezepufufotak.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd0bd4c5a21---45789859265.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608df079d2e0e---buwamifawerilibig.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609395d582c74---bakepetevevetuwa.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf6222ffcd---28037803819.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/gapaxevapapuzufezow.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/xuwirubajebar.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/7efd2ca209638987e747bd8e684bb660/85185324884.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/44601792962.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/42418464124.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_off0000ed6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6C 18024 bytes
SHA-256: b1431fa47bcb39014d70d51875d9af47211ff8493991296c9a44eff2c2b8b6c1
font_01_sfnt_off00011b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B87 10792 bytes
SHA-256: eed23cb436ed6b8dd3156ba115080c7a9d5f9ac6be6bef0d1dc6438aedf186a8
font_02_sfnt_off00013460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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