Malicious PDF — malware analysis report

Static analysis result for SHA-256 86480bbd26fc8eb0…

MALICIOUS

PDF

89.6 KB Created: 2021-07-24 17:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e5cbbb3c46c1a19635ea84c3b6d4539a SHA-1: 1182fd8a28dc1463b25f71e8955bb7a5201892fb SHA-256: 86480bbd26fc8eb004e4132f1d3f2c24569539b4cb380d030d8d6ac8307aad10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of a link farm on compromised CMS upload storage and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://homeopathyhk.com/files/25435824667.pdf In PDF document text
    • http://jarosi.hu/files/file/vomulitareli.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/63792588212.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/36381276312.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/46512482796.pdfIn PDF document text
    • http://ezibra.pl/upload//file/jezutikoguvuvisegazutil.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df1d67bbae---vanokinimisi.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/wasagesujanimo.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/zipafatemixiko.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f91cb079c88---61631329355.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/81217908132.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160850d335bb3c---19800357100.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b758476e4b27cbd295913192f4c3ddd7/vuvorujenetenadinunuxamo.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/memuwawasolisolepadaxo.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/211492ea79c12a9b9e78a7337df993b2/22391875966.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/658524b6ed9237ea4176634bdc325e05/66591468879.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/94d307de5eb9ecd8d33c5c4310ab2924/42443013438.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/3974a0e9fb57ea31696fe4471e1b4a26/widexeropagoni.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4485f3a42---70835615987.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/0138c09948d7118441b622201184c4b4/gidovabi.pdfIn PDF document text
    • http://cuiquji.net/d/files/56578183712.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b63a6aebb07---22173464251.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/xojokoziworiwizulomirire.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/xamawuwatigofigazupum.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8e7301bff---ruvitezifulapujuguveseje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=what+is+neurosis+in+psychologyPDF 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_off0000f6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A8 10860 bytes
SHA-256: e3fb3ae555431ef46c20f503e0585ee2ad57e514c8963505e6fde69e7b64e8e5
font_01_sfnt_off00010fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC2 18544 bytes
SHA-256: 485645e1cddf07a1cae2ce39c9166a57703f35f367b7bb3a1e10f0f1f8c250b4
font_02_sfnt_off00014042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14042 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1