Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec49953cdcb4bebb…

MALICIOUS

PDF

111.1 KB Created: 2021-06-29 09:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: db248a6d74b53804c14579292694d13d SHA-1: d695c32796a3f8780a4cb92a5eaf5efec6d682f2 SHA-256: ec49953cdcb4bebb58f667d35365c47d1359a13c486afffef17e015f1a6d53e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://crysiq.ru/uplcv?utm_term=biology+life+processes+class+10+notes PDF link annotation
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/d2fg3hkpgfkmig0mm8opsmf1q6/47056950715.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/45868820115.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/speaokubcf9bg6ns7eb8uvr9ae/zavoditijogofese.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pf1i6br5nmdb7k1nvr22uomsv0/52637656464.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160803b99893e2---98571051937.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/gt6tsebu27ltgiu5jib6cfv4lk/38928838675.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/1n3ggd2h03ra2bavc1b3s7ftrf/vabonapalaziludogef.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/oiajuemuun0ip1t7bmed4801n5/97291171667.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/kadaxufilojubuvizig.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b47f5e78ebe---pajopigerasesugowu.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/3cb56336a65bc1e5a6cf1c22c2bd6e70/8258110372.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/76940794413.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/25928064980.pdfIn PDF document text
    • http://klpa.net/userData/board/file/93711756101.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/11b0d9f8b0e83df472f5b76f57891693/43707253693.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/2b1164990f2c6b4621ffa6466e0b41b6/dugeputesujoped.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33a644783f---subedilarifototulew.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6000c0ac9---zodudasudafipupinemo.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/b82eqeiimbcsandh74haavk0ah/fogode.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15bd9e224b---jetajanebasamude.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_off00014fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FED 17504 bytes
SHA-256: 1a05a8d4751d055ecbfe29ac90c784718e7635ec1268900cfc2a13c7cd75112c
font_01_sfnt_off00017d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D89 10996 bytes
SHA-256: ca2eac8596d76dff0cb4d11bf15865a34381d23d28c0ed589cb2dd55c371ad6a
font_02_sfnt_off00019752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19752 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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