Malicious PDF — malware analysis report

Static analysis result for SHA-256 789bc4b7d116b57c…

MALICIOUS

PDF

85.9 KB Created: 2021-06-26 04:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5b7036ba82d16d3189afd9c3c4007ac SHA-1: 15c270f94baea73ee928facf006524fcda38802a SHA-256: 789bc4b7d116b57ce6b4889fa8a2eba40e4120907907643c3051937710e7b17e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous links pointing to compromised WordPress uploads and disposable hosting suggests a link farm designed to obscure the true destination or host malicious files. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://festival.bg/fckeditorfiles/file/26541775409.pdf
    • https://triosms.com/userfiles/file/somuma.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607daaf0196f0---32483975737.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/4deb26bfdae12963726b525007e66584/volunas.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb72590dab---wijizejipowiwukemux.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa86c82166a---32780299115.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/g1to9sfnua686onetaiq4n8hqc/reworelopebakibuko.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a762920e059---80252567998.pdf
    • https://itacademyindia.com/ckfinder/userfiles/files/gebilikuvoxewexebiv.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/7dc37ee1afe99c86f540e267868f4f42/nofafovowitev.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/503111b86324028d889b8f7ee2b64bde/vumotazebimewanopo.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160730fe508d01---wewepuxasolemevomola.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/25f56013e2dc2433f0c7abbc28f5381d/mizawel.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/14ee5b6a6e335db18dfc866d0414456a/kililigimasu.pdf
    • https://cubic.is/userfiles/file/35935054219.pdf
    • https://mimpishio1bet.net/contents//files/37507941074.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/a6554a8791fbe75eebf1cfc8154d87c6/detasutupefulatikusi.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5f224cd58---46624328204.pdf
    • https://birgatour.mn/js/ckfinder/userfiles/files/xopumoxafafig.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/ba1ae527b2949316acdcefe5bf10afe7/93674257764.pdf
    • https://zold-kommando.hu/files/xafav.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2cc2d95b5---17519960107.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c026ca869---75546425375.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/c9b91bdbf9ce1ed3d8b9426e097a87a7/61073265469.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=over+breathing+causes
    • 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_off0000ed99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED99 16792 bytes
font_01_sfnt_off000105ab.bin
2210cde08116fea100722326deff4cd04d6e49401e0ab401789e647e3f0f4f0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x105AB 17120 bytes
font_02_sfnt_off00013219.bin
9634b1d1166aaf1c446d2f49bc1a08eb7b1fb513a2179008df1bf45ea26dbe49
pdf-font-stream PDF embedded font (sfnt) at offset 0x13219 10676 bytes