Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d35f24bf7343b91…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 18:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 008fec62c4a042b1ece5516611cc0cfd SHA-1: 4cb0854fe97db58b71993bd68131e17a00b068b6 SHA-256: 8d35f24bf7343b919d55b645b9e8a55190c63e36b400e3a747939e034e5aced4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ced803a6574265e973f630454c198bae/44624808808.pdf In PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d7bebc7bb---zotopivunog.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/61731072844.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/15a516c8c5fd2b050a4e6016b6026a04/viviguzojow.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/qgg017rhnt5cm7nefbgpd16h3u/nuwozilatakobajosa.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/m1crnc6gu9u4n23l0btdh239ut/ladowe.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/53871259708.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608683810d474---49580860669.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/4158216b20cd99b7a0cb00a4b1f4aa3c/2343988646.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/namaraziwopuwedasesureves.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/fefotalifono.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/41643709200.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609891a3cf7d8---5037477861.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/45742570018.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/winuxenegibofekatizeleviz.pdfIn PDF document text
    • http://premium-h.info/files/files/14728693933.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/xeguvunuk.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc775ee3079---sosotarubidujezupil.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/gazamuge.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971b615a7b3---suvigobofufawasujeduveb.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/61376809198.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/59611727191.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105ca571565b---28416955016.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f363455ca---99404830157.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/90944280240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=present+perfect+and+time+expressions+exercises+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_off0000d896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD896 10836 bytes
SHA-256: 66658dbe540bab0402b08367927e0ea4dccb899dc7a0352b30b6bf19e0b43320
font_01_sfnt_off0000f1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B4 18268 bytes
SHA-256: 4a2f43ba711f20088b632a88b83b7eeeabc8ce0c1c22280e592feff311d68bb9