Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc48ddebb5eff73…

MALICIOUS

PDF

82.0 KB Created: 2021-09-10 21:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b044cd688125ed7246945063975507b8 SHA-1: 6fbacb580bf18445ff95403a28647bb9b09bfc5a SHA-256: 6dc48ddebb5eff73371d9c103a125ca100a2260f54da069d696898302219c08e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that function as a link farm, directing users to potentially malicious or compromised websites. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The document body is heavily obfuscated, but the heuristics indicate a deliberate attempt to disguise the malicious intent through a link farm structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pixomot.ru/uplcv?utm_term=new+top+gun+movie+release PDF link annotation
    • https://2winit.com/Files/files/2747702398.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/tutofudiguwojaz.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/pizimijeboxaj.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/56551299979.pdfIn PDF document text
    • http://topflexsports.com/uploads/lerejolupe.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/fowuj.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/61600118245.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/24460903258.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/83995276408.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139efc9426a1---52493972482.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/pinumodagoderaxozeniz.pdfIn PDF document text
    • http://yepuco.com/uploads/files/77654551498.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/5679cbc24a1190aed5f617b3302e872b/44523271828.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/68907028112.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613386e79646f---54871043435.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/bff805b2ccff43da7b609ed9050d08e1/91691390406.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/vofojine.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/7122372955.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/gaxojozelifax.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/35cd3cf0ee39f4a7a25a32ae601e83f5/lokunifimivepelupijekip.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/84232350438.pdfIn PDF document text
    • http://plncse.hu/php_data/file/54554440889.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffbc8cd60e---bakujugodapogejusolekekos.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_off0000db22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF339 10824 bytes
SHA-256: 61bc5207e97bafc8ba47a5a5699c020143cdd25bc34666766bfbc9ed6627b12e
font_02_sfnt_off00010c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3D 17868 bytes
SHA-256: feb66d20553b95775a0ff5924a716d8a6de3abe734843075e05a59e52457e60b

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