Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ffeb825e3a47b07…

MALICIOUS

PDF

82.1 KB Created: 2021-08-24 10:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6494a2ad5f8b3d896633698318f6179f SHA-1: ff6d0017c756513491d8b03c26f2b3f3b0618bda SHA-256: 5ffeb825e3a47b0715d6c691ca49fc2cca1f84dd0bf2c98c6f995e5779449171
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://huntic.ru/uplcv?utm_term=animals+only+in+south+america PDF link annotation
    • http://juha.be/_files/file/pudoruku.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/8283063749.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d205fb49c8---74705074393.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/ca3387218806401bf7f06fecbc4e2bc6/suziropegimubavisoranox.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/geduwawivevewamonu.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/kn2usd2dnkrgri0k1flpjodcct/zututosofoz.pdfIn PDF document text
    • http://cci100.com/clients/57496/File/52020003815.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/9ov5j7eu4lvd6dped8uqvb4fs0/97343636904.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/sowume.pdfIn PDF document text
    • http://foodchemsino.com/d/files/47304693502.pdfIn PDF document text
    • http://potlista.com/file/files/20305939529.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/951ae8b2fbc9d12afe64889760146598/79879897516.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e3738915598---56696185933.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/l9b3341u8ca5jhbani0958upat/dovabo.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210617_DE65927234C629F4.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/b514227b57eb69826d11748adf51c5bb/xisuzinojomipuwizezalux.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/97511097221.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/6d343ad463c45d028e02581a971a1f62/15877619053.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/d8b628feeea7648a13b7bd9196cc4350/nilanogusawubikizenanisud.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/tutemekitukuwapagusomu.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/nutuxabevijipejap.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210611_195752.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_off0000de5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5F 17096 bytes
SHA-256: 9d5aada44fee4b2efe5c4dd9e20ec716f29859b32ee5c45108c54431991598e8
font_01_sfnt_off000109f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F7 10688 bytes
SHA-256: 6574b7e42777d72f9f8ce97565d164da20d7fd65f39fe4699dde5fb87abb0ec0
font_02_sfnt_off00012259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12259 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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