Malicious PDF — malware analysis report

Static analysis result for SHA-256 a452951d2ff29f01…

MALICIOUS

PDF

73.3 KB Created: 2021-09-25 01:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6c4bbba0093b42ecfe3635032593158e SHA-1: c60fd70ef15cfe3ee476bc7bf89dfd013f6e833d SHA-256: a452951d2ff29f01c2997d829ab2d539de1377a2bd6f97ef2babcd59bb8320c1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple external websites hosted on potentially compromised or disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using numerous links on various hosts, suggesting an attempt to obscure the true malicious intent or distribute malware through these redirects. The presence of external URIs and the link farm structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d3c6c601b---jatimezivenekoru.pdf In PDF document text
    • http://kdesignuk.com/userfiles/files/pituvegu.pdfIn PDF document text
    • http://apart1day.ru/file/wuviravubuti.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/7693690166.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/51964331682.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/3887546959.pdfIn PDF document text
    • http://bscartridge.com/pic/gafixet.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/83058959842.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/89205852732.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/86e2b6e72c39e8331edc883ee8c2ea35/xelolafikuzatopev.pdfIn PDF document text
    • http://viettruss.com/upload/file/kewomi.pdfIn PDF document text
    • https://andhimazhai.com/images/files/vasalomegovukikukef.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/texapikepigerovufufewor.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/tatokiliparotefipesewet.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/tumafapitenexam.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/14400609255.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/49274372034.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109241649303386.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/65921929297.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1976546049.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140d46c2e232---18216529343.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/tufedipakewegipuxogutid.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/jegonizezirigexobelamewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pop+up+blocker+chrome+phonePDF 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_off0000b9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CB 18064 bytes
SHA-256: 605d3f7ac3ffcaa8e21619d3c0a1d7eb0088cd5ec63de943ac2cdef2bec74c44
font_01_sfnt_off0000e81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81E 10452 bytes
SHA-256: 78506ba948e6cc75ff66fbacbfe31089ef3e6677e709cbde14cb799f4b41d086
font_02_sfnt_off0000ff68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1