Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3fbd808bfac813…

MALICIOUS

PDF

82.7 KB Created: 2021-09-10 19:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 79f79e29c5f6a0f7601d1f6ecf1b0765 SHA-1: 334b29b09da92a99bb9991aa7ce39ea86f21c02e SHA-256: 9f3fbd808bfac813ada6df5dcec545f41f2365421a6bea992b360a9c78391d0b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely contains instructions to open a password-protected archive, a common tactic to bypass gateway scanning. Numerous external URLs are present, suggesting the document directs users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://inwebjor.ru/uplcv?utm_term=bloqueio+celular+android PDF link annotation
    • https://sangolongphuong.vn/longphuong/news/files/vakipupokabogilixiki.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/44397806925.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/26314922839.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/06a55f2ee88a3a6e983fda2e40a543ea/74981673678.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/wokavuledukugixowodaregir.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/gedogijabazid.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/nshq6432kc7edk86me8fs51st7/radabuwifijovip.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/071523195370.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/roredidezotilakidujo.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/vovigebevumufibajijev.pdfIn PDF document text
    • https://iword.de/userfiles/file/1033026988.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/39277319803.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161387d9ce2cf1---sujodorinexerorubugiv.pdfIn PDF document text
    • https://kultmotor.hu/images/files/24656809906.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/72326966816.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/78629210690.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/demamagesuzitupadipuko.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352c438777c---25651061866.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/51744287002.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/45d7d9c78ed163e6db77fa49fe15e69a/38558874309.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/53037079549.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/27398016152.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/bifinalasurokuse.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_off0000dd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD18 19548 bytes
SHA-256: acca049284f151be11e61512d2fa436ef7ec7d162b27da09504a26672744b502
font_01_sfnt_off00010ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F2 10396 bytes
SHA-256: 46df9ecf2dd2c7fbb7f4d54921565db12e2dae43a9283643a09ba26da7cbdec2

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