Malicious PDF — malware analysis report

Static analysis result for SHA-256 d780596637fdf662…

MALICIOUS

PDF

84.4 KB Created: 2021-09-19 05:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 68bb7c09a5ca7a0182a112c51e54d558 SHA-1: be105baf7b983676f32b71a560f1833609d63f7e SHA-256: d780596637fdf662f491a9630f5bf542875eae65e6e5dd7e6eee83d67bbaa9d8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://osakaav.com/userfiles/files/94789497690.pdf In PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/85860557456.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/42837746289.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/79904336609.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/gewebenagaserafezinir.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/28159278776.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3da8eddb8---53102856237.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/1840328002.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/10328681898.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/kujexiz.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/badibivarusowufodutug.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/98770561733.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/52015262220.pdfIn PDF document text
    • https://faceless.me/userfiles/files/fasofifavina.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/72650627822.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/1738961661.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/tivuvodesebusifono.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/somefogupuzimusadinekubuw.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161343e4495ddf---32119169142.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16145d91680612---gozidavilukotuzekow.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/wubixajofubijikipewumodo.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/tinovepaduvamavunifabeso.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/4a105d1f79524a22c3cceaa321cdb280/85995567111.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/neberiketeku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=aplicaciones+para+automatizar+androidPDF 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_off0000df5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF771 10816 bytes
SHA-256: 037716282b0794909dd6df6dd27c649c6b4af1a2f14d9f685e78aebe41370d43
font_02_sfnt_off00011077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11077 19856 bytes
SHA-256: f47830af3bc4a1f28abf63ccb91e5024b9df25c90089957e8dd62c07aef872ec

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