Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ba636cea6349d3…

MALICIOUS

PDF

78.5 KB Created: 2021-09-19 06:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5d53a426ea645ff98e643389b83015db SHA-1: 89dcbddc14d3261d68fd49f7601d0b8ce93c049a SHA-256: 08ba636cea6349d3746a4f81c398b98bafa8e66b400e979ed1ae1f8d96940156
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and embedded links are consistent with a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dpsszczytno.pl/photo/file/92887515848.pdf In PDF document text
    • https://loyd.rs/images/file/73328826978.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/31038140103.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/wujebewapuze.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/gavigegekisulutowixamuje.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/56275594391.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16145ef607cb29---30493193609.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135be091b86f---jepulepumapu.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/dozowezape.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090515273133.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f71ffb86a4---29429525705.pdfIn PDF document text
    • https://ewt.cz/res/file/jamajurixekuzuxepu.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/nawimuwulufuzo.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/nenizana.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/87033075518.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210916033841_1054750367.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f4d02d91f---92448763817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=naruto+shippuden+280PDF 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_off0000cf63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE775 17108 bytes
SHA-256: 7d8251806e57d2fb338ff0d730244f54fee5e3d69e4fb74fdd267319d8911a77
font_02_sfnt_off000113c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C4 10972 bytes
SHA-256: 4e63d20232cad4958d4462b39b2baf62ef803d6f6836094b08be301689f266a2

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