Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b05557a241f416…

MALICIOUS

PDF

82.7 KB Created: 2021-08-30 17:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 64f3988d7976d0e94cbc928ee290c75c SHA-1: b90830facd9a12111eea3ad7d08ed64d3ef5c7be SHA-256: 58b05557a241f416af6daae0e8acbc4e396c74bfd5c6937b7a7db37a30cb7b92
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document exhibits characteristics of a malicious lure, as indicated by the 'SE_ENABLE_LURE' heuristic and the presence of numerous external URLs, many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick the user into enabling content that downloads a second-stage payload. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://archism.ru/uplcv?utm_term=epson+scan+pdf+extensions+download PDF link annotation
    • http://bainihu.com/upfiles/editor/files/nelura.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/13946096149.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/11d883dab072d0e487f9cc8fc166758b/21053674399.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/44493173919.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e7f41c56b---7418352975.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccc75a4930---33856227736.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/rimisodototokojiwijuz.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/fajutorenorinobu.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/67790761129.pdfIn PDF document text
    • http://cutskytools.com/d/files/jexanewukusabaxem.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/89650097078.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/2erngrd3q66p2ih8vfapfv6526/40792456616.pdfIn PDF document text
    • http://thedreams.cz/files/xugexum.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/muxugukilufabab.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8772e358a---xerepuwuwa.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/66000421861.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b428c7b2d322ae0c81bc254e2250a1f8/4617595397.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/51610905643.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/xiferilu.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/kogitokol.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/pikagujanulabofirapabig.pdfIn PDF document text
    • http://hexindechem.com/upload/files/makolokozo.pdfIn PDF document text
    • http://daikinhbac.com/upload/files/tufodoborirup.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_off0000df66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF66 10684 bytes
SHA-256: 941f143488c45c104a79fab8f0de271161e219774e89bb3428de5dd7b2974831
font_01_sfnt_off0000f81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11031 16828 bytes
SHA-256: 9da5728bf4ceac8914a45ba40af088571f35a1bd847b5c4d4a3a5fe7debb8ba2

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