Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5aaa521f5eaefc4…

MALICIOUS

PDF

87.7 KB Created: 2021-09-11 01:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6ce40c6144a66363f042e6b0d38870d3 SHA-1: c472e83ce211f4a123e983a612188b9eeae0b542 SHA-256: f5aaa521f5eaefc4bb34536711f979b5e072f832ef4a2d27b3cf290c8589b3cf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malware. It contains numerous links to compromised websites and a deceptive download button, suggesting it is designed to trick users into downloading a secondary payload. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=bios+for+ps2+emulator+android PDF link annotation
    • https://doluhosting.com/calisma2/files/uploads/54824717272.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/0fe1ad23279f7c970dcbe4c6968f0517/8794884248.pdfIn PDF document text
    • http://thaide.org/userfiles/file/50449955267.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/rimisirowopuxufaj.pdfIn PDF document text
    • http://alcantara.cz/data/file/balapolifexexigibavegivaf.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/79369123796.pdfIn PDF document text
    • https://best-label.com/upload/files/taroxesuzipufivaxetegafo.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/53767981206.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/pubesujipuvok.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/6236550180.pdfIn PDF document text
    • https://scalping.ir/data/files/file/raloralubaluvozirekekuzal.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/jevij.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/54796626511.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/vivakunebelopowobet.pdfIn PDF document text
    • https://thepainter.asia/upload/files/50774261294.pdfIn PDF document text
    • https://sanagustin.cl/files/dedowodevesisijavajal.pdfIn PDF document text
    • http://jsdarvin.com/files/vulapa.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/lutukilafelo.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/pakemujikogen.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327fdec6e27---selonigerolamozojevuzupuz.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/wavumezuforesam.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/85264043989.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/neximivukixuruxelezufe.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/gumadunutixuveluxexumite.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/36212656174.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/a0b092b34e87be8378d94e46ef85cc5c/malivole.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_off0000ebb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB4 10932 bytes
SHA-256: 45a39c68b0979957e725cc005ef0e8894b4d36a660c5dbf300ea8d786055afb7
font_01_sfnt_off00010519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10519 19732 bytes
SHA-256: 9b3620aebe71f8b19ebb2efb0a969f905d6000b6723d5408a1501f684921d52c
font_02_sfnt_off000138bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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