Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86e81dd1bfde782…

MALICIOUS

PDF

73.1 KB Created: 2021-09-09 07:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 198c3d1e8ada47563e9dd97c43e3a121 SHA-1: 8469acce7f5e4172c64908e3d4f09c9d648a5811 SHA-256: f86e81dd1bfde782ebd10f161df06bda6470ad39dd7b7a1e93e6a09f99849ffa
184 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. Heuristics indicate the PDF links to compromised WordPress upload storage and uses a link farm strategy, suggesting it's part of a phishing or malware distribution chain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload via the identified URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/57881846571.pdf In PDF document text
    • http://whatcanidoforyou.eu/publish/file/6949634557.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/e5a3879f919e95934efed26534910e1e/7334523975.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/fasejakides.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/rifajebofejovavujevaxep.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dd88ea374---11480166615.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/81601420445.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/21327608262.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/64824394880.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/48597384975.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/betijesetuvalutirota.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/4203053859.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/63f6a3.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161327f20b77fd---mezawilujad.pdfPDF link annotation
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/kivipupilovamefalesodizo.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/kiwopolubuleguvamixag.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/61503203998.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/18622243831.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/lolufimopulomevisewo.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/rijidutuko.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/40010121480.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1852c7ce6bcb699af280e1e249b3b4df/65930865869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=maranatha+music+praise+chorus+book+pdfPDF 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_off0000b876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB876 11164 bytes
SHA-256: 187e3713d42905f555df5ddb829fa7f1aabcf67dc480acfbfb2df73dcb72c9a6
font_01_sfnt_off0000d223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD223 17212 bytes
SHA-256: 396c53b3ad3357372e0879967025dc000e3f194dc678dc2b13ad5ae828e5b0ac
font_02_sfnt_off0000fedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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