Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee54986b9dc7a807…

MALICIOUS

PDF

83.2 KB Created: 2021-06-21 14:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e0d44192edbf8b16548bd463bb20c187 SHA-1: 5b4b4300ca4af05e5dfc0faaa5ee993ef20e560e SHA-256: ee54986b9dc7a8071f4f8465df2fcd94c65eb81696cccc98b65f2e24f20308ac
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to an 'Anker soundcore mini manual pdf', likely intended to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=anker+soundcore+mini+manual+pdf PDF link annotation
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5227cc504b---91872651557.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/29416109004.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/9014fad0f5bdd4f714dfea7bebb0043a/fetezuxidunumuxopu.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/it2d9a9je05voisu5ni4vobjdc/62111265675.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/95235661242.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/gepufipu.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f37755853---talelidebaninewunelo.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/kogewinetoniserifit.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/uv6os5802r13ujt52cdls0hq6t/99115135591.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/6a10a382c715dd95740345b16355b18e/13614211408.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740d909e76a---lizokij.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/0593ead4b7cc52d5c128b36db01ac9b0/zebupijebamufo.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a418ca58886---1256980241.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/39532169684.pdfIn PDF document text
    • http://mp-journal.com/media/file/guwukaj.pdfIn PDF document text
    • http://salt17.com/userfiles/files/pamefobizojudisu.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000129d3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x129D3 16972 bytes
SHA-256: d50fe3eea9fc9262fc79f3d8cdfe56a71c74ea2bb89708c08e44a56325a223b1
font_00_sfnt_off0000e147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE147 5356 bytes
SHA-256: 6734684c19c4438a44637c89fbb55036949cd8d37e524393855fa8a89fc13ae1
font_01_sfnt_off0000f361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 2116 bytes
SHA-256: 33d80b5e357abfa3ea91f5eff18928953f8e36d8e9a7aea158c838e8ae756dd9
font_02_sfnt_off0000fd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2B 13568 bytes
SHA-256: 86e0532461f6f8618bff8e0c5b2147737365f7c53af4cb0e222637866b6bdeac