Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39529b21dda2dd9…

MALICIOUS

PDF

87.9 KB Created: 2021-09-04 08:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fa311a43bf0135b0f6f57b03766f16d7 SHA-1: 49b2d6eaa4a4da493aeca5c357c8e8c3bf191d3c SHA-256: c39529b21dda2dd9522e0dc5473825cff90d6a2bf765792fd260fefc7cbba761
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting domains. These links likely serve as a distribution point for phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/5ebf37eb06b9dbfa68c8e4cd328723e5/mimekuko.pdf In PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/d5d43e5985a6b818db47dc33f5b7ac26/15090596474.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/96454403232.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/54050566807.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5e708074baad0c90e4e2a233e7fdb0b3/nezanimuzufenujazunegaka.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/32590323126.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/34871605312.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53cae92961---6439222959.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/lesanodil.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/faworizifotuzi.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6bbc852df3---masodel.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c7dfde38bf---46365267965.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/6934608715.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/bbb22af6628289955b719a97f0e749c0/buriretikogokepuguremab.pdfIn PDF document text
    • http://ausafe.net/images/art/files/62101687337.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5b169774e---takokanev.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202108160412243883.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/95925865173.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/c8c0f770675b4954649c120b369554fa/88949971597.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078c36f304bd---lajazabepuburi.pdfIn PDF document text
    • http://ibb-online.ru/f/file/bexidajobaxulinomuru.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/93226776981.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/pivuvamesatupefekuz.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/9c98138255ec1f39867d3c91fa6a097b/xizakepowisibeniworum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=matching+analogue+and+digital+time+worksheetsPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/68f3b57dd76330183be49c528e460d14/kanoluwexakisuwu.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_off0000ea2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10245 11088 bytes
SHA-256: 7fc33a6baf0970ed4f0d222a393d6298ce4511c7f0940841f37cd709add4d6f0
font_02_sfnt_off00011bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD6 19908 bytes
SHA-256: 0d283ed61b1642650541c9fd9091a4b6492e8c1260faac3ad4839ed1cca58367

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