Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad217b8c471302f…

MALICIOUS

PDF

123.8 KB Created: 2021-09-05 11:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a75ae16bb8840c6b45f792e7bd69f14 SHA-1: 689776a5e0ec5b5a2fa067347ce092ee95cbc2de SHA-256: 6ad217b8c471302f756dbf6c71e18feaf90d0f462294bc5a9d7425d516d74dce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to numerous external URLs, many of which are hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute malware or conduct phishing. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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 http://huefpdf.org/upload/file/woxidozuj.pdf In PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/zikugulada.pdfIn PDF document text
    • https://termoformat.md/img/files/jofiluleto.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609901e3c9d90---pefepifugepewabega.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210427221249183.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/bb5c339740708ae37d20bf050fc2305d/70570009993.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/18077569023.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/618479151d2316c6ee16be19d63d46e8/pemenejaradebalubofajib.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/7064d79610f8e667ea094c9b230a8dcb/48710385962.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/71087542165.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/91463307086.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/62284790246.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/8ba8d17dd41f7d3e42c549a3a11c8838/deben.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607487aaf4001---4670355926.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/puwefifagowomepeborebiju.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/8palq5f1rnuevvonoie56kpdg6/5089374739.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/viwujolewugorukuvow.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/11d34681291bebf58d2c45cb103a1b18/wizufijore.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070f0b9be129---36501142433.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bcaaa5c515e---41727452949.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/gibegusumisetafagavet.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/wakexav.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606db52a9b9b8---tazadoxutojetelaratida.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/mefen.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/d1a0ae33d32c326b755c196e4987b4db/vopifetovozagi.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109d74092133---dediler.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=solving+square+root+and+other+radical+equations+worksheet+answersPDF 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_off00017de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DE7 18500 bytes
SHA-256: 33d53b224ab98b1fa0530242bf41cc755f692d4073094c3ac3f7a06724981504
font_01_sfnt_off0001aea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C6BD 11212 bytes
SHA-256: 5cf2867ea0597d1b8073b239659ffe774dd229faf94399646d9b8c267db71d8c

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