Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd80c0bf51dc34df…

MALICIOUS

PDF

79.2 KB Created: 2021-09-05 11:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aa0c7bb1d66badcb5e378aca5806079c SHA-1: beaff594f80471c26aaebfd97e704e23c6cd4f77 SHA-256: fd80c0bf51dc34df0753ab00ab2bc2ca50688ee72f70c89b025a869bc6ae9952
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users to these external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://inwebjor.ru/uplcv?utm_term=autonomic+nervous+system+pdf+download PDF link annotation
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/6e38d8b8a99a5d0ba0fe8402c3e83af2/96161901830.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/nukikuwuma.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/92683314664.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d9b0867896859b764d2432280c6cb2dd/43248090248.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/zexazutimigipijuxudef.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce2f47ecbc---xusoxojenudunipekuxini.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/72008767207.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/97469e6fac49d4f52db278bae0844d46/lobewat.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b18d671f43---21608195734.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/954e6dc10ebc837e8e6e99ab7769befb/89527993675.pdfIn PDF document text
    • https://motacademy.it/file/bupadama.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/gerodimimunonaponorisurow.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/totape.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/20370726552.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed1d2bae9e---23567717293.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837ac09bb4b---wemelalasoj.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/9560066ebb12d95a6c36d8f66486e324/25020705840.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/3e1qrm8oppepcbm77c11p321mn/98008722011.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/46799143375.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/zikijifimiduv.pdfIn PDF document text
    • https://shopabrang.com/images/files/39090039322.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f46fba9d0f3---zakotibaperagesivot.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ki6au6dmcu9aqes9sh5jnu9epq/98863803662.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_off0000d22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22A 11128 bytes
SHA-256: faca3d5a2e1c54a24eadd198e62730b2d50598f7681a088579af3238d312e012
font_01_sfnt_off0000ec46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10458 16708 bytes
SHA-256: 71e68114b521f3c70c80d0d0205f7373b89fe4e27d5b7fd8d0c4677da3f03231

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