Malicious PDF — malware analysis report

Static analysis result for SHA-256 faefd61235a20beb…

MALICIOUS

PDF

82.0 KB Created: 2021-08-18 05:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bd0cebf379bb7c9bf8c8d45c365b9156 SHA-1: 086fdef5daaf2ac595931cc528e30f52d2d450ba SHA-256: faefd61235a20bebc28c39465bb95bb54163147c0a76569a7901c51e00d932d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • 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 http://pdww.ru/ckfinder/userfiles/files/34401299058.pdf In PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a90d3d6f8---dotupef.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/e3a9e50e81358032f0017676c07021be/givakasuvolofix.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/l290bngupsbjqsggtvqjj42ji0/11697864547.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/d172d91b93c01480f2bc8108383dcf53/78246773405.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f44a1612e9---73927189452.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/28459057537.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/d2svbva85mb1ch6gg17gv6ln30/veboza.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/dubalaruz.pdfIn PDF document text
    • http://mths1965.com/clients/6/62/626de2090e8268457c7577d5e8b87900/File/worixobikafawijupafuw.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/61899328776.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4681f33c7---lagoguw.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccef7a300c.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bffbe4aa30---81707746706.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160943ca6d50ab---buxogoburilerajubedideziw.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210529_5A721858AE80101D.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210622010618399.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609015b64d6b7---lomigewifu.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac8ff3e982---70143156968.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/2554b0ed91d07e1a42ed2152b22ad05d/simiva.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/38495186804.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/39069205240.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/2lq2s98djlolakqhb4gfs6a6mh/59051399293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how.to.measure+bolt+patternPDF 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_off0000ddc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC1 16632 bytes
SHA-256: a32434da74fd61927520bcf3839adb012290dfe978cc03f87c81cf5d739d7a35
font_01_sfnt_off00010921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12138 10704 bytes
SHA-256: f05bfcd84fd63768a333b95b13fc72e0c1880fc4884d78c04f991669a8132b73