Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9d1c1f6d5a1048…

MALICIOUS

PDF

81.2 KB Created: 2021-07-05 14:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b79f4037a6c3401a0c2defd80b6dae18 SHA-1: a4189a92dad1f3eb455d1a7ea4d33c1daeedcaf0 SHA-256: 4c9d1c1f6d5a104801e7e92d7260807573d4813431f5f89da9101945b2a64fec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://jinistudy.com/_UploadFile/Images/file/39170519940.pdf In PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/30504293347.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/eff4e5df47ee5048ebb1b04350b6266a/48747704839.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bae481dab---35820309649.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/wegedukujile.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/49445200944.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/56594343444.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/d4dccdf4919c4907d5205180ff4b895f/gusul.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16077aa4fcc260---zitevumonibefoxizof.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd48374df7---suxutukowaronidurix.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/17619363766.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/35319528035.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3e5a703e0---42056269874.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11f70c6ce9---zelebejeronudenapulid.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/jutuzoxiwarezot.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160749a0ddec38---xewofojupebalasovopesasoz.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/parazotifapebijavu.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/89527615053.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/67542972024.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098871dd66b9---1253710680.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/d6cd485ffc68d56ad09da4f4ba270f86/bopavativopapukuk.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/58590510409.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8309b8d824---42830114056.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/57227094072.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/sowarotifesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=freshwater+cone+snailPDF 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_off0000dd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 10388 bytes
SHA-256: 5b3b71f5d7e1b2be111d32060f4192135536e44cd5b676e096b18b31e1fc76f6
font_02_sfnt_off00010cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEA 16484 bytes
SHA-256: 716d558afe94c215e6b59c5e778e545f9f1f379ce149f9c0ce823abd1b441610

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