Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a00639bd134679…

MALICIOUS

PDF

82.2 KB Created: 2021-06-09 23:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: fa68a3e2e87976f57e06edfd4ddf3460 SHA-1: 32c5a2242455acd570ccf9110e88682ab443e54d SHA-256: 89a00639bd134679867080b715d46ce73f68e02a9f69940b9d54f7978063a9ad
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document leverages a lure of 'ninja tribes apk' and contains numerous links pointing to external websites. Many of these links are hosted on compromised CMS platforms or disposable domains, indicating a phishing or redirection scheme. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://huntic.ru/uplcv?utm_term=ninja+tribes+apk PDF link annotation
    • https://cosplay-expo.it/ckfinder/userfiles/files/32033468066.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/qtrouorq9lo76q88c3oa85mvle/tiwigozigupokonisoxu.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/gamoturuzedodumuduwota.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/25c457149419dc33bfa141f20e759178/42248900582.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072002e92ce8---bidemesoguwoseduzo.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/jadalubovepeso.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160872d6258922---ruwowosawavopilofol.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/8b7f7cfb7a6e48e4b356ea946d3b3f4c/tuxobeweliwebafivu.pdfIn PDF document text
    • http://topas.lt/userfiles/file/geditekaniwakiwuf.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744820330b3---23314141084.pdfIn PDF document text
    • http://www.asslar.de/downloads/81782666072.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819ee75c1b1---495698551.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7d66accd4---5322078337.pdfIn PDF document text
    • http://guchenes.com/d/files/petov.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607996f25517b---fakafawuk.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160771d0d17f83---nujomojugowo.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://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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CF 3440 bytes
SHA-256: 97ccbdb760a0e3df5732132e5d3bf45da361772f41f3dd9d552c9a7b16db5e73
font_01_sfnt_off00010320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10320 5028 bytes
SHA-256: 8e9a9775d6e6423dcc8e45fedc496815123087762ce75214925aa9186af1b41d
font_02_sfnt_off0001144a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144A 11624 bytes
SHA-256: 74c0e2db899c08c81761bd8ed49a6cad10ba7b5ca9dc064efa15c701df5094a4