Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2a4da7a8c77cd8…

MALICIOUS

PDF

82.4 KB Created: 2021-06-19 09:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: c814453997948d1f80d17a12f2964952 SHA-1: e4b4f1e0c0adb4257969bac9e651632300a63503 SHA-256: ca2a4da7a8c77cd83c83ad6096f8b176aea4c54dfefbc203e25d2e059257e749
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://autotrans911.com/thread/admin/uploads/file/38638614053.pdf In PDF document text
    • http://asea-admin.com/_userfiles/file/20210503231643.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/jizaxojudadusotis.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608645537f89e---toxegalagegenepolux.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/537ef8f2386d174ddbb0251fb3a8cb24/fopoposowukobiseniwod.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070f8f0a977a---mojafafixu.pdfIn PDF document text
    • https://kawanmto.net/contents//files/9455183179.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160782bdccbb42---30104970211.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab76b86a06b---79510573094.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/f9b23886fe0cf0be491cb68082f682b9/15759199536.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/2627613138.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9476d0abd---86245386984.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/r8q9c8u8q2g5hd4vjetag63jnb/dulomifajodadenikewa.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/0rdmuc7f87o5dkl9sprnljbkf4/xumavolelubaweg.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/g8jd3okbt7r66r9fo60ea31st0/fizevute.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/s0q1rli67rg152bk4h943n50r7/53924605980.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096be677df60---88832168346.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=white+lynx+point+siamesePDF 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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94D 5148 bytes
SHA-256: 6c03a75e87ffdaf1b5acf5e54cac5ad7b04369474bbef4918bbefb5ef4a6da87
font_01_sfnt_off0000fab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB3 7084 bytes
SHA-256: 00b78dd6f3bd798cc6e4f4b0a29417a665c4b5251cc7de0a96950dda3bff500d
font_02_sfnt_off00010e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0E 11296 bytes
SHA-256: 1e238a743ff2f0436d5868c3c9d82df2306999f414787c734dc4322077b46a2e
font_03_sfnt_off00013471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13471 1736 bytes
SHA-256: 5095ccdfdd328c3f25b1766e9c65bca58fa839170fcb9f3db3c20e130d955aff

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