Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d0ace0a46b3d99…

MALICIOUS

PDF

68.9 KB Created: 2021-09-26 18:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e037982c868ca6a35c27a540a9a2ad0a SHA-1: 0cd300414f26f80952f92695e6f5d716b648d158 SHA-256: a8d0ace0a46b3d991f3f0b3cf388e8e7b51ba1f6586ce5d423cb377bdbfcb7e6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a link farm designed to lure users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the nature of the links and the PDF format itself can facilitate exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://coretry.ru/uplcv?utm_term=best+apps+for+samsung+tab+s7+plus PDF link annotation
    • https://songod.vn/uploads/image/files/suvisuwubikato.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/defete.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/bovimimawuwe.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/33293073026.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/77201418421.pdfIn PDF document text
    • https://hoalavender.net/upload/files/zutav.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/16946985249.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/16306890372.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/soredatesamomoxavaxinaw.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/127bd87d61cbb580be6b07f8879e9e32/31312341533.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/xadugagopikozasapuget.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614137c201c08---83092390745.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614f0f7360faa---famon.pdfIn PDF document text
    • https://felicityokolo.com/file/83356094573.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/rupekapi.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/dumopoxivedajotaxaputo.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/tofapep.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/83158075329.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/getemolazukukulugoxoka.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/91610414393.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/9h2ibdfo646070vs9cajai4ra6/3952729315.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210920_0AEBEFCFA617C1C0.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614d25c291115---24120129977.pdfIn PDF document text
    • http://taociren.com/upload/file/2109042102409313777fza8ecj6r2d.pdfIn PDF document text
    • 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_off0000afe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE4 14828 bytes
SHA-256: 0df8a91d2fc81ca6d3a3e5a106a8bc920b4a88d23255bc58b8ed5ef7008f4f23
font_01_sfnt_off0000d4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EB 10952 bytes
SHA-256: 2d2e87f95954c58a67c2d5a8781b38183009b8af4206bbbbaec3b911913c884e
font_02_sfnt_off0000ee39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1