Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ffa1cdce499272…

MALICIOUS

PDF

79.3 KB Created: 2021-09-08 06:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fa95065e120af4aef741619bed280e74 SHA-1: 171d21d41e580d1e870adc968ddaa6786f5d5327 SHA-256: f4ffa1cdce49927256e0072463c8a402a9965090abb481e98e37980ad6c962d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external URLs, many hosted on compromised CMS uploads or disposable domains, indicating a link farm or redirection scheme. The embedded JavaScript likely serves to obfuscate the malicious intent or facilitate further exploitation. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://chcial.ru/uplcv?utm_term=rubik%27s+cube+oll+algorithms+pdf PDF link annotation
    • https://hondamienbac.vn/userfiles/file/fubatow.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/42542562352.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/51827008563.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/57851d9d588d4ee80e85c6eb94bf3d54/3863961489.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab69337a85---346247864.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/dumezowubujupa.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/c3550018d11f483c8dbc56fb11311d7e/36756799131.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/pabisawejulogufuva.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/sepodisilelobowatinefi.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/83116712578.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/99209337142.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/xuwasemipizeb.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac07cea384e---61403244089.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/vugojebinoku.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc5f3309f9---tosurirereveradifi.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/d14292ca99c468caadc5cbff1abc7a68/belasimokugegojiriluzajo.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30d77a3c62---pusujipinunibadazasa.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/91345209840.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098c3c73fea6---nimaxivobejorasuno.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/luvibuwezusekuwe.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/51494200042.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_off0000cec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC9 11376 bytes
SHA-256: af2628d2ed767b87a553cd717aa8dda079220d17750edc528821db9b911455b1
font_01_sfnt_off0000e93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93A 18508 bytes
SHA-256: be870995091df2af8e22525ab849530b84cc8b50a3440e30a1a0149e89b51c4a
font_02_sfnt_off000117dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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