Malicious PDF — malware analysis report

Static analysis result for SHA-256 6add50b8f856cde0…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 04:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 84008c0ee5f355fb4eb933529971c8cf SHA-1: af83ae1e838addc65090707bf5dd6b898442c9ce SHA-256: 6add50b8f856cde028d43a6b9e0547c1458a7730023bd6851057a7dd047fcbcf
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://northcity.rs/slike/files/pojebasuv.pdf In PDF document text
    • http://otvorene-srdce.sk/userfiles/file/wubatumasopibu.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/843803166b54b3e43f42be539c302765/63291497522.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/c438815c244c80e4027f000e6e89db59/47884377790.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/bibok.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/werunositajiju.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/67456950547.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/82340973796.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/taduxel.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/2eaa2f7d400a201afb352cbc1b1ab46d/foxuzegepu.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/kolr4irkhmgtfiatvkv4hk4ap0/56817601025.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5205cbd24---daboduloduxo.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608282aa7b86b---9864567128.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c424c7c38f---755054190.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/9419209169.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/74880358358.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/jediwulal.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/pedesupozip.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/29049240467.pdfIn PDF document text
    • http://camonetinternational.com/files/file/watugusazajegax.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/nizowetije.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/41bb417dc28e8e5964faeafa5032e1bc/naguzexiteb.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/jegixetulubezefip.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/worilapowuwa.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a9d45b12b---48498921667.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/94515876391.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210905073651540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=save+email+as+pdf+outlook+webPDF 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_off0000e33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33F 11012 bytes
SHA-256: 4fd4576437553093ffa86799ffbff1686818fd747551b05eb4aa94f700563d9b
font_01_sfnt_off0000fcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB2 17336 bytes
SHA-256: 4cdbbacc9f603362381842eb57438b0185858dc24a45bd5aa7947f3416d63bc5
font_02_sfnt_off00012955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12955 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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