Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a625b18e2fe903f…

MALICIOUS

PDF

90.1 KB Created: 2021-07-21 06:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1962c199494efab9985e83b76b38ab2c SHA-1: cce39f5e497dcbfe472f0bcde0e801e81252d9b0 SHA-256: 4a625b18e2fe903f1216047e14aecc2353f9585870b9b588ed97fc959fab61ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or distribute payloads from various sources. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/0pimka2g8ft1efltgp3rbfe70n/67712751761.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f5ee06da6e7---dozevekobatodaporadoji.pdf
    • http://imailbox.nl/images/uploadedimages/file/dufisapopulep.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4373c809e2---rezozobufizubaziderirubux.pdf
    • http://al-farh-iq.com/upload/userfiles/file/bubobuganuvulepupebonigo.pdf
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/worabojaduve.pdf
    • https://kfk-dekoration.dk/images/uploadedimages/file/40814426396.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/92109e8a6758156bba5d354c565f381c/75536826794.pdf
    • http://aaz.sk/editor_uploads/files/71176359492.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906909aded8---jerazirukovalopagaz.pdf
    • http://anchor-m.com/js/upload/files/75905982291.pdf
    • https://allegypttours.net/userfiles/files/fibogufidosuzi.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2421c21728---mopakinonifas.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090057c148af---vipab.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/b8f2faf9638728531d4b8b3148d1444c/92797247591.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a5876c8fd---zokinogonejo.pdf
    • http://anpo.vn/upload/files/nowonalix.pdf
    • https://liantoong.com/archive/upload/files/19151130331.pdf
    • https://ilexgold.com/app/webroot/files/userfiles/files/93245394817.pdf
    • http://annandale1963.com/clients/69704/File/59260283842.pdf
    • http://www.yoko-ono.be/images/userfiles/file/jawiduxorujev.pdf
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/81454318675.pdf
    • https://bem-sa.com/img/file/71988500911.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911a4a17ed7---17595394400.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=english+a+extended+essay
    • 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_off0000ff9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9D 16792 bytes
font_01_sfnt_off000117af.bin
c61884989ae41047d5e08f811b526c955920890eb5535d1b1669791b3e7f2564
pdf-font-stream PDF embedded font (sfnt) at offset 0x117AF 16900 bytes
font_02_sfnt_off00014394.bin
ee861470411c95932eb0af6aa71d9b6ce700d80d2d9f26900d1ecab95c6315c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x14394 10504 bytes