Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae36c2f63e84101…

MALICIOUS

PDF

78.5 KB Created: 2021-08-22 12:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 38d83f96f817476135f91415a6516e79 SHA-1: 167df72fa39003ce16e0720a0d12ec4537fc1f2d SHA-256: 9ae36c2f63e84101f415503ab8de690baa8a0fc2e22a7b3e7f0b9a0c6a31eef0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous embedded URLs pointing to external sites, many of which are hosted on compromised CMS platforms or disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites, consistent with a spearphishing attachment attack vector.

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 http://fence-alarm.com/userfiles/files/botuwi.pdf In PDF document text
    • http://hytechplus.com/userfiles/file/41458686104.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/8pah9b8msqshv11hrviahd5406/kiwuxi.pdfIn PDF document text
    • http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/93432583501.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/jifuwimaduwatirujoz.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/97332343749.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/9sb7u9gmsmgg944nt1nuf216bf/38016110308.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/kaxafuwezugem.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/56ca0d1b3122d2ea2d35eb669607bf77/40964970745.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/o1e8m7s8ai1op5e2cq4tk7lu64/97057337590.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/rufexakofumipufosugetone.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/hklggriimo5agvkse36j6c3as6/fevepusufozibadiwex.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/busafakidigo.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be0f648b368---ruwegamuvelakapubatifow.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/minapaluwaso.pdfIn PDF document text
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/jirufodiwilu.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/242668294.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b76f2bc7---rurufafevetekowufuziwuv.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/mewatixeb.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609627e28199e---33896413047.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/41309378742.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a84b54f72---27315042588.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3382ab753f---13203020324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=trading+profit+and+loss+account+example+junior+certPDF 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_off0000d0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B3 15668 bytes
SHA-256: 1bcc08ce92b9580ca25cdd6290aa257e77426019fda531a8b4f51f448017b317
font_02_sfnt_off00011117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11117 11256 bytes
SHA-256: 4318df09d67c28350d07f6acdf1495abbdeb4c104cd4788a98b10f832ddcdc4a

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