Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea43710f9e42a80e…

MALICIOUS

PDF

73.7 KB Created: 2021-07-17 07:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3b2db14e317a9ae9cc57c1e2b916d5ce SHA-1: 1f1891d4ee5727b28f4a561a841e073e2bc32830 SHA-256: ea43710f9e42a80e151c85c8024d0585c634aa74d051adaf12f5b5931b7c0f96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the link farm indicate a likely intent to redirect users to external, potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a396aaccf0b---44623556321.pdf In PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/qs0cicelgdpke2mdba12q8887c/93611643568.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/m6b26abtcmppjdgnjngj12vuae/93588700615.pdfIn PDF document text
    • http://renovator.cz/files/file/62196697869.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/fa3752de6f10aaf5c26af694b26f32fe/44692094249.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/72136620669.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/be3e33490539ed38761986c389b3116f/83424514959.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fdda1c5ad---23437467657.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/9b5c714e088ccaed2455381b5f044715/razivubusuwexi.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/814cedbdd702ea5269c36f4df8274d1b/fopilisaxivujemidebuboj.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/zulowesopewikirakune.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/ef40f28187cad6019cf3fbe196316e08/selobunumibi.pdfIn PDF document text
    • https://bem-sa.com/img/file/zevuratagefunekibit.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/77711841182.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d231666180---naxuwukano.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/27621839315.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/41582789945.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46be327a9a---numebubujoxak.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/72474357753.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/limukigigelekawezenal.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/d609371f38d2eb43138c57cd685d9ad3/69053820556.pdfIn PDF document text
    • http://passionsavannah.com/clients/0/0a/0a61c075fa1d7d91f8ce2ef588f7e9ce/File/bomekibepuzanetoxixufiseb.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/b63fdb5ba72e7634f2a12bf1709404ac/fuzodabuxemaroside.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/melomexesikexinera.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/89740532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+your+dragon+homecomingPDF 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_off0000bcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD8 10896 bytes
SHA-256: 8dbd1785b3bbed1d49f82188e95ca35704236fa3ab28ac224760387b4672a646
font_01_sfnt_off0000d5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBD 16784 bytes
SHA-256: 90a9d321bd63cf5f8d4e4921b0b9e5cd8ffdf999b7f0106db6fa673358e86d6c

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