Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d578a32b5ae3ae9…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 13:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7092f5c548fd9463d2354bfc25db261d SHA-1: c5125ec1df8c56b9d3648932354189bc385edea0 SHA-256: 5d578a32b5ae3ae97a2f8265a4e31c3edfe1fa80ea1b642ca4e8baabf594f165
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm pointing to compromised websites, likely to trick users into downloading malicious content, such as the 'pubg game download' mentioned in one URL. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://parkettworld.com/upload/files/kalixupovuxuduv.pdf In PDF document text
    • https://marljivo.hr/UserFiles/files/54343862780.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/73060603749.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/94531602222.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/68316675585.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/bijimubol.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/28886975516.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/wavadede.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136e22bd342f---55290106835.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/povamatevexavufavidafez.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/nagijukujufiluxugexolom.pdfIn PDF document text
    • http://identik.hu/editor_up/gadusedopelujakirodi.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/dufelizuvenovelofit.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/firadomenevexexirata.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/pitijevipagaz.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/zuwowejodedajas.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16141a90d13c13---gasoperiwuzozofomi.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/wuguzagawukemiwesopaxuzi.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/kekidojoligoponugiwe.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614138a59342f---82103235531.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/4a98fbad88b26292300e859ad9102e12/tugefuwaziwawitinek.pdfIn PDF document text
    • http://erex.hu/upload/file/58755416872.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=pubg+game+download+latest+versionPDF 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_off0000d92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF142 10984 bytes
SHA-256: 5545852ca66b2bf533c1b1f45bce1524c074a4ac66aa7b4df79fd1c7393f6eb5
font_02_sfnt_off00010a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A91 17200 bytes
SHA-256: 32fc8ea1a38d87a13ad4d84006bbf6641a33079e6ce6f12bacecaa009b074544