Malicious PDF — malware analysis report

Static analysis result for SHA-256 028d85a58829a1c8…

MALICIOUS

PDF

81.1 KB Created: 2021-08-15 21:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10c07911be639f9500f77ffe50f49e7e SHA-1: c4f199a5cc0b3d027e2842bc026fee8e9e5145e2 SHA-256: 028d85a58829a1c875dc9fe21ff73e2e7cd6633ab7e843b9060ee2a30e2a7f97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to PDF files hosted on compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160748ab124cf5---bajijusotojukuwepan.pdf
    • http://year-c.com/upload_fck/file/2021-6-23/20210623014545400320.pdf
    • https://caribemed.com/userfiles/file/fiboxebedusaposatevenif.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/354aa00efa067a1bf59d863e667b9b48/50209790658.pdf
    • http://podiummoda.ru/userfiles/file/80877641598.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16090568f91513---60482516023.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/rsbinesh8ekqfig9pvr0jklog5/298103054.pdf
    • http://sammyuriasproperties.com/userfiles/files/22371448722.pdf
    • http://www.contectrade.hu/fckfiles/file/rinof.pdf
    • https://infiniteprospects.com/FCKeditor/file/63449042739.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/c2e5349f59f436ecdc70028898dcb707/kixejurigujerafubo.pdf
    • https://damsindia.org/admin/uploads/file/60482226678.pdf
    • http://rszm88.com/upfolder/e/files/20210715164449.pdf
    • http://douzonebnf.com/upload/file///povovemagibiz.pdf
    • http://auto4-spb.ru/public/images/ckfinder/files/nedadorodopel.pdf
    • https://www.micron21.com/application/third_party/ckfinder/userfiles/files/vinimi.pdf
    • http://bukharaatlanta.com/sites/default/files/file/wupipezawimozimafu.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b61838bb4---kajiluni.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/mpa4p2quuj1m3s43vnhj2b1cl6/nazovinawolid.pdf
    • http://emilygrilltogo.com/uploads/files/55515913107.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/5e2e51d68bf541e7151a7d6cbf7149b5/6174003045.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/u031fmf5alr297v321s3mhvenl/69260830721.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=el+caballo+de+troya+mito+corto
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8cb.bin
04c2b422cfcdd7a5d563c89864c124261af2459424f3041c4d687ffa12ed40af
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CB 10496 bytes
font_01_sfnt_off0000f0af.bin
5a5386a3bd26f8cfa34ce0d3d2b5624c4510729fa2ad4a43ed2e9d4d76e76d9a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AF 17620 bytes
font_02_sfnt_off00011d66.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D66 16792 bytes