Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e97efaa7a777a26…

MALICIOUS

PDF

78.3 KB Created: 2021-08-05 03:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e8eecc3ba47d877c1d9cdc2ec024628c SHA-1: d090902081b16cf2d4fad68e3985a7e18a08aa81 SHA-256: 3e97efaa7a777a26a80989a735a2255ab9c9ba5a0c35c106a29d9ce304000b79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous external URIs pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate it is likely used as a lure, potentially for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=ejercicios+prefijos+sufijos+6+primaria PDF link annotation
    • http://www.peretprod.ro/content-images/file/newuxamajaxev.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f372c4d55c---35673802306.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7abb5c3e1---18324579640.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/1100733026.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/1c8p7gtbmgbjc236uq88tdqn7t/94399228503.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/39698941327.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/51967689001.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1608a21d64ac12---80012191013.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b744d5e2bc---95616812991.pdfIn PDF document text
    • http://kbchina.de/upload/89022128370.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/xepuxunupoporogetez.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/pebemuz.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/rubepebukalujiwupojutara.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/95830643437.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/26375032384.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/0ec8572880773536c49186d91d0d30f7/10835236991.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/38359cbf1a8d1995352a865bd18fef06/29454351693.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/66cia5rrah24n1ooeqj350rj6b/lefamebapewamofugirin.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/96973077011.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/23511096311.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d39258df79---vunipasodajovipizuxeliseg.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcdf04f27c---tevomijux.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/pubofaj.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/e60e705426e2fd227becde7956bbd46f/16437139336.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/23768918646.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_off0000cc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2F 10776 bytes
SHA-256: 84bf6e2f89e6cdd0f8331d2a3d89b026d737b40b43619bdcd601fbd9c14ea926
font_01_sfnt_off0000e501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE501 17832 bytes
SHA-256: d20bf671b70d1ef0960f212beb57d2bb7f333fe5eee1606b3b691c3215540e3a
font_02_sfnt_off00011197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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