Malicious PDF — malware analysis report

Static analysis result for SHA-256 110cd22e1087f902…

MALICIOUS

PDF

95.9 KB Created: 2021-07-04 06:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e51e5b73ad8ffd30744456ed131f7b3f SHA-1: 0f93393e244b554050e5e17c1c73ca181e6fd993 SHA-256: 110cd22e1087f90214fed31ae5c2731c7e461aae2e202fbfc8f622000cf4689e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious content or download further malware. No scripts were extracted, but the link farm structure is a common tactic for distributing malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://murtenhof.ch/userfiles/files/kamiretepitami.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e78b9123d3e00fb7a1b682ced4f5e67b/sixomazeremuvulave.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/tbtc3203l32d829tev6katmdq7/gijazowutiva.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160845bcbdea8e---5057149308.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/terediladuvuxusin.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/45a25b9150fa69439e4edf3a2905c23b/26788849265.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609254a744666---netazojopamub.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ef44b8fed---vaxudixosewizazotovi.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/61393533126.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0a8037d0---zefaxuliseka.pdfIn PDF document text
    • http://camonetinternational.com/files/file/83140095112.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///33100957907.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/r3i6jv2aupjed1vk6k61j1o663/19523100653.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/xavesazub.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/woxorex.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879ed2b0cbc---gumilekozarajusak.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/n9urbo9cfh288ur1atjsgus4cv/musozisozaxatofuj.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/64653546908.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/vemanirokoxajuk.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16082b5e1c4a50---65803198153.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/2t96qjcm3f7l2vv6djr17f5up8/dadililuvomunuwaxulumej.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/62603151321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=the+fuzz+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF21 16380 bytes
SHA-256: 1452d74fda6f049ffcec1a26b012a22d6aaff4fb9204f9b8438df89dac1e8aa9
font_01_sfnt_off000105be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BE 19056 bytes
SHA-256: 5edd281c67b7c2c4bffc5f29499924b0097398b15b3eba9e79162e22405f5e3d
font_02_sfnt_off000136e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E6 10252 bytes
SHA-256: 912c4c9a073ab363112c0bfd5d4f36623a1801b2bbaf2c85842abac30f521593
font_03_sfnt_off00014db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000165c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165C3 2480 bytes
SHA-256: 1b7aa7169f75538badf43d3c69f14fb8a4868415f9889b69071a95bdd221b6ed

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