Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca83bc9fabfc969…

MALICIOUS

PDF

74.2 KB Created: 2021-09-05 19:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a93011d27c37120ab3b768edc5cb1f9e SHA-1: 78fc8da505a1971ba146eb8eaa1c46509e487a1f SHA-256: 8ca83bc9fabfc96981803393794de3f539067c7dda19916392b5d9a33ba60f25
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple links pointing to compromised WordPress sites, indicating an attempt to host malicious content or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to create a network of links on disposable hosting, likely to improve search engine ranking for malicious content or to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b076a9b61f---47210088748.pdf In PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5db9fc5e0a---debuda.pdfIn PDF document text
    • https://eurotig.ro/file/fipuleji.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/f4ee1be7874dc91dc3dd4aef1db07459/xubivupivak.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021719231455580.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/juxidelizerimup.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/69249396580.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5fbee5e92---97806790965.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/ziwidumasetewagos.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/vesolozirakolabo.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/ludak.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/fegaribudujiwu.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe8cc11553---bogozalepo.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/pebarosopowidomati.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/turujibugoke.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/43494656803.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a015d1596---80575765105.pdfIn PDF document text
    • http://garderoba.sk/images/_file/kurapu.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/obunf6n3aov16i2r231ldovua2/burodowusowiren.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/feaa400cd1aa59b4877a407839440dbf/dinutinivegem.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/top6811ia4ic0t3h8lb235o3pf/88057775079.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f212ec36bb---giridola.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607926282563f---bumuxa.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c025e201508---guwav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=microbiologia+veterinaria+libro+pdfPDF 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_off0000bab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB0 17688 bytes
SHA-256: 74025f47a5ac9e617e3548d692e88187ea450ad8131727920ed13fd943444efb
font_01_sfnt_off0000e8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 10828 bytes
SHA-256: 8116638a66ab4a41fdf48e4464b5a2a9580f58c67b1b64afdd28bedaea647a92
font_02_sfnt_off0001017a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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