Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f2286e16d04ec0…

MALICIOUS

PDF

75.3 KB Created: 2021-09-21 02:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d6e7678185b1530598d0fc204094dca1 SHA-1: b0a6d2430576cd453a46b95216e21b6cf92f8307 SHA-256: b5f2286e16d04ec0845d50e2c33ea45329fed42fbbc9013863c7f3f7561e63c8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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=getting+past+your+breakup+pdf PDF link annotation
    • https://ra7a7p-h3ba7.com/contents/files/vuvewolizupisawaveg.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/ef91013cf28736223ffd229ed7cdfd48/bijanemisedatujox.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/dexopateligepaxoweletub.pdfIn PDF document text
    • http://dolgoprudnyj.inhome360.ru/admin/ckfinder/userfiles/files/nexiguwasuwujifulinukub.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/lejag.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/vesetudovunuzegigewe.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/sorigegimuvon.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/wekobosumawi.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/a8b2a20c2cedc98f0fa61c2b8c1fee65/46675173144.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109101017459275.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/29612447669.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/1862117739.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/69024376493.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/53f8d79b73d01c29034d3772eca94f28/wogamazedalijadewofisono.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/78315245942.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/vodojefobasopexufagebiza.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466d3f5569b---18128768645.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/17438308082.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b777e3d8a0---givevi.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/faf6dd9fecf62fb09416290d85843993/kobexotu.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/nozawe.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/fefomazafitanikasagivu.pdfIn PDF document text
    • http://nature-revive.org/files/file/96169237200.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/2792836003.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/84305918407.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/volekixoji.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/42962235643.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_off0000c2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F4 11112 bytes
SHA-256: da6ad27db07d1b37d8035db8b31b42f5c8bf81269896f1c11b81be0d6598f4e6
font_01_sfnt_off0000dca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA8 16692 bytes
SHA-256: 5206596736dea16619e3b6af61705e105360ad38e5379c45fdae6407acf981b8
font_02_sfnt_off00010799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10799 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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