Malicious PDF — malware analysis report

Static analysis result for SHA-256 d034f3f46d423303…

MALICIOUS

PDF

86.7 KB Created: 2021-07-10 02:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7db24319c74f26ad822fe081f8f686a3 SHA-1: df8c9f20fd51ed9ce0c687637f3d9ca841041088 SHA-256: d034f3f46d4233030f7cd1d4a4943e3aa293c3bd231002fff7fed9a34dc94602
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to external resources, many of which are hosted on domains associated with compromised CMS uploads or disposable hosting. This pattern is commonly used to distribute phishing content or further malware stages.

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://orchid-daikanyama.com/userfiles/file/zoporerawuda.pdf In PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/rowiveletabulojuwogub.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/0ic9o7vaehhr3j9sma90h4lipo/90672744874.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/d594c4cecc8b8ce097fcf45300c2767a/bebafoxojurarez.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/438481c79f374b18010e2364fd419392/59438240176.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/30847940992.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/80325393553.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070643dca19b---dilel.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/nuserajufijiwipogimutip.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/91011708328.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160777571e0090---34762272974.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/zazoguvirufivo.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608aac107e6c9---tiziwumofil.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b08e3371e4---nebutezupowuvotobuxubowek.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16086ef67cea6d---23502888120.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/72646494500.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/lejijavinugapukel.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/vagebutufisuzewegi.pdfIn PDF document text
    • http://geraldkleinlaw.com/ckfinder/userfiles/files/73615683871.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/mavokotulevusag.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bab06608985---81312999961.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/25530632317.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd56f1ae0b---zijisakibupovokuruveva.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b07e728fb000873647ce20f30d50082e/mamujivazovibapawasajub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=fecl3+ionic+or+covalentPDF 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_off0000ecdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDC 10272 bytes
SHA-256: ca7e61a8ea32bf7b6a10b6d2fead97e7787449e965b06da582f6f12acba01592
font_01_sfnt_off00010423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10423 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C35 18980 bytes
SHA-256: ccafc85c9a36bae44d4cc9f038b332c026d9780d40c914f5d46c40a3cbf4d132