Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e22a953292a7fba…

MALICIOUS

PDF

82.2 KB Created: 2021-09-15 15:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0a0876f1f20470dee7c040ad3a7478d6 SHA-1: 911b43bf727affbc10039f50311c02bece91d122 SHA-256: 9e22a953292a7fba549a067a832fc07c382c0911b57a58afdbd976124b9e72fe
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest a tactic of using compromised infrastructure to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hutg8ingindfoohqpitqsq67d0/sukuvapupezowupatotole.pdf In PDF document text
    • http://goodfortune.hk/UpLoadFile/file///zosewasazopeloviduta.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342d13988bc---pawuziduloxijabojevanomej.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/17239911417.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/75893330086.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136addfd67ae---77923304716.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/febitopel.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109031307198035.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-10/20210910083004988796.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef02e3cb9b---79132501987.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/suremejajoteganar.pdfIn PDF document text
    • http://tavio.su/files/file/kezinebuto.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/1306327032.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/wutafejitomepo.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/kizeg.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16132c3e3546f8---79556542996.pdfIn PDF document text
    • http://holzbau-napetschnig.at/tuwimuromirewabugosel.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///tizovomone.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/pibijiri.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/61593217505.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/43372938a8f0a1ddece0903e5d051dff/63193641880.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/35382567964.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/savozegozamudifaju.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/zodotuzepuwakikurezif.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/40849984948.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/79f3a5dd6b55de75ecc6fc6a1ad7ea23/bukadijagopogurepenug.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/gafinogowexob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=iphone+8+vs+android+phonesPDF 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_off0000dc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC39 17632 bytes
SHA-256: e8bbaf2fac5cec8d5dd13eb51b201d93ba89e5ae0fd597db96cdce15a83d8ce8
font_01_sfnt_off00010a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A48 10568 bytes
SHA-256: a98d9cc78f4ca9f9660cfe79ab4d810e88a8335289403b86e85485764409e0b7
font_02_sfnt_off00012258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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