Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a65d7e5035f79a9…

MALICIOUS

PDF

76.3 KB Created: 2021-09-14 05:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 736290f9d529d1758fad1177a072cc96 SHA-1: 6880990a9d7f9cbb101fefc0093b3b29ea9e769e SHA-256: 7a65d7e5035f79a9958bfdbb2cd7905cc48b9d9766aa1d62d478faa2fea970c8
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites and a heuristic indicating a visual download button lure. The presence of these elements suggests the document is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ibliberia.com/ckfinder/userfiles/files/92127587803.pdf In PDF document text
    • https://tlkingatlan.hu/kepek/other/file/80600262255.pdfIn PDF document text
    • http://adice-area.com/pictures/files/tanenaxozetovesivaxesoz.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • http://faceconnects.com/ci/userfiles/files/kobubaz.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/70267738717.pdfIn PDF document text
    • https://terracell.pt/images/file/jadipiboxe.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/26741804782.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/kozuj.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/euu1iu9esfqmt74bgu57v4gc71/pogilovagolugud.pdfIn PDF document text
    • http://ducnhua.com/upload/files/nebubuvis.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/lisolakorezeru.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/d3d9d14f45a2009cc21ed96742c3e51e/razeripuj.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/a244ef21315dfaddd78990f515aaefac/gijuzoginozifexulovem.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/35117939418.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/vinababi.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/jexeta.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/54004047409.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/10368981645.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/42468161731.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/19709266636.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/53869899755.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/51887983930.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/dosukarefizufuder.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=download+game+sword+art+online+black+swordsman+acePDF 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_off0000c467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC467 11032 bytes
SHA-256: 030f12cd98193f7ae9217eac26e66f07c73d3d15d7f6015014d56a009e0bfac9
font_01_sfnt_off0000ddea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FC 17432 bytes
SHA-256: 45ac222ab6b6f0641a060353c30bc55bc57979a91f054c179da6994c43e34083

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