Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd5f557f52abb3f…

MALICIOUS

PDF

70.5 KB Created: 2021-07-09 19:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7fff71b895be6c6dd03a5ff324960af9 SHA-1: 4beda89671254606c888f1c3c6073d9e46383737 SHA-256: 5fd5f557f52abb3f79d31f3bfba1ec7c2b6c57221c451d6d9749b526d644ba1a
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic indicates a pattern of hosting malicious content on compromised web servers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://baloneacessorios.com/_upload/file///kejibeke.pdf In PDF document text
    • http://khachsansapa.vn/webroot/img/files/27632705191.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080afc0a55c1---fijiwutukajinekadodadefon.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/92500353691.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/ijsi4u44cqmnr9rrb3jojkosj1/93879663087.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/b490ml65b1ah6jc4h2vbpbmqf4/84934551835.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/ed8dc300fd9eebfe9e6b913af1a3f54c/16619140043.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/a44h1k06ek6ocs8notnnu536d4/7734968523.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/0bdbb871791f05adc7e1e53cac6d344f/25931092544.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/likagadometaf.pdfIn PDF document text
    • https://cristalensi.com/public/File/tedep.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8a3091e11---fufaroditig.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/nezigagebexotewid.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea1324ff7e---47323059751.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/kuriluxuduwifawexivopis.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c37924b44da---4390070292.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/63322738323.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/73255774032.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/69bd9aqnsdu043o9ut53265ln4/nisimufibebakasuvim.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/7796def976b4ee3685e797cabc46766f/12590746029.pdfIn PDF document text
    • https://cecprint.com/images/file/bugep.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/81363010310.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/bivobagubobotaxajov.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a30c50a25f7---63860135627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=no+country+for+old+men+criterionPDF 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_off0000b579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB579 10500 bytes
SHA-256: 357aa0c0f15cbb2b574eadd9a4485577fe2f321ab0c6d59fd54a9f5efb0e58e7
font_01_sfnt_off0000cd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD57 15376 bytes
SHA-256: 534d8f61dd01685ea4f3081889022549b5bd39d74e87d7957f096d77d3bb6091
font_02_sfnt_off0000f4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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