Malicious PDF — malware analysis report

Static analysis result for SHA-256 eded42c1226ee446…

MALICIOUS

PDF

88.3 KB Created: 2021-06-14 22:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4e0c78341837e2eed103a83542ad4141 SHA-1: 7e008c3644372642a2c39c9a1b7efa56a7960fd2 SHA-256: eded42c1226ee446cb77d4bd018bec31b2ce196f2e8fbe32ad34d700347a503b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to direct users to potentially harmful sites. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://chcial.ru/uplcv?utm_term=trig+ratio+worksheet PDF link annotation
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a66363d05d5---42423416922.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793e6fe8ce4---4307519824.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/f5a2bd3fa9f834d8548533d03467469b/vonat.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/gfh6ogj404ek1vivo3hok9fobq/46990775238.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ea8c08195---zazak.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/4325au00peb3sp0i1renroq282/20129323228.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/zutojogowixonem.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6c45cc7ed---zarixe.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f7792cbca---9795656993.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/52c702dd06c5dd252a9fe537989e876a/zasakabodunuvixomiwaz.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4541109c9---voduja.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f0b8c4a79---73485411018.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/89215192472.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/nosivikerulugapirezagade.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16082e2b392769---83378129777.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/gt3j7a2pdocvt2ajku7k5qa6pa/xukewibepolutefap.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB80 6988 bytes
SHA-256: b0a891008aac8ea32a6874fabafc3faeecde555de36a85bb8bdfad54dd289a99
font_01_sfnt_off0000fd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD36 1964 bytes
SHA-256: 86ee88d2f479c7f6b33757b58910aef28daaa9d9b736dd12981443c8e7ba2ecf
font_02_sfnt_off00010683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10683 5020 bytes
SHA-256: 38b32d7494a4452c8bfbf027e5faa3fa6728f2478cf8426fc747930ca8d9e9f3
font_03_sfnt_off000117aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AA 11272 bytes
SHA-256: 49467c13539522e54bc4519cfac274cb793b0a7e74de890d2090232e62b26fc7
font_04_sfnt_off00013e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5D 16104 bytes
SHA-256: be6f97a2cd1eafc36d4c6423c79d4587a8fde3f87af739994d89a7af24efd4c2

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