Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d852739837f22b2…

MALICIOUS

PDF

82.9 KB Created: 2021-08-14 02:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1d4bbc1903e7c15f87aa478d09c2acdf SHA-1: 1205cb88009c8632f544f9c66f770254920f51f0 SHA-256: 2d852739837f22b22d743e001875345f860b88aa95d207911c763e5e66c23aad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and links to compromised WordPress sites, indicating a phishing or scam lure. The embedded content, though heavily obfuscated, likely facilitates these redirects, aligning with the typical behavior of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://laborke.ru/uplcv?utm_term=how+to+use+tool+on+rug+doctor PDF link annotation
    • https://textmakareknutsson.se/upload/image/43152082148.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/fh1lfh5e5v7vdg8b0ql3679q83/vuvunimaxego.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1880d3ce66---gadesilumudade.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d2562136c---redaravin.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/82652738460.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3d3cd6662---90555429686.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/f3b00821d4d376f10f20e0d6dd3d3f29/morawedazekogegebinak.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16079f028b2b9f---givedonasirokuzidozixu.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa21745ec3---girasulo.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/15769016010.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/eecc7a9ebeff86fe1f4fcb9131a5095b/27445024757.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/tewitenabazexesixuvexazu.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/3d081eb653cd7f0029dd4b6ac5b6bed0/52263873734.pdfIn PDF document text
    • http://svx.su/ffile/file/kimajijet.pdfIn PDF document text
    • http://starlightcelebrates.com/clients/4/43/43e9139217482d7666ce300faf566241/File/gakuzez.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/sobodabopivagosu.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d765a1831f1---59852869130.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/37134538136.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/kedimugodopagulibivisima.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/6502958517.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/20117440809.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/digod.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8303e4818---84552918206.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/bekugobifobifowonakin.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/kilozogasewub.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/sazefuwufesokero.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_off0000db68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB68 19948 bytes
SHA-256: 38ff8cb1adc151c6efe1ff6cb24e6d5211725974c88b912ed6a9455f763134e7
font_01_sfnt_off00010e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3A 10468 bytes
SHA-256: b49219ea6470116c533db5098b888b92b5ff58ce9d164bc9b8a96f3665941468
font_02_sfnt_off000125fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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