Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf6a9fadffe6e6f…

MALICIOUS

PDF

77.5 KB Created: 2021-09-12 16:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c8bdbf439274ad77955e304f8c6ed7dc SHA-1: 8776097dd64ec449b467ea50fd6a91f7d21a093b SHA-256: ccf6a9fadffe6e6fd04b7861b4ddd46bf612742a09c07ae75e30a2bd7ba03e67
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and links to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://irlanc.ru/uplcv?utm_term=compare+between+eukaryotic+and+prokaryotic PDF link annotation
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/pasodef.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/tozupakatomokopedefutu.pdfIn PDF document text
    • http://elpijisystem.com/file/lilerexezovumisi.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/82719904406.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210911_141927.pdfPDF link annotation
    • http://fcgo.tw/uploadpic/files/60366580396.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/tigufe.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/boripanugij.pdfIn PDF document text
    • https://tekartltd.com/upload/files/bokewir.pdfIn PDF document text
    • http://pi-consulting.ch/download/tewixurulugifamojar.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1h342kj5l4nv58skmo31bfh0s2/41094564566.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/birazuporovipajunus.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136aef7089d0---xitegakodopajavud.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/68076294533.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/zozuralabetuket.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/43681512988.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5d5124393---muvizibu.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/22192281767.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/lorux.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/tosetu.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/jurumolubisidasugeke.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/fubarowixoluxurafogopa.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1df5598da---3774916396.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_off0000c920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC920 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE137 11024 bytes
SHA-256: 71f7e11abb6e374b700f3c12a2d48c7b90ec80fce0894943f83988a8748d7f03
font_02_sfnt_off0000fab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB2 18128 bytes
SHA-256: c6152cb6b9f69809dab9a8ca3a6712b4ed14e9fc8e502c1125a4077faaf97778

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